Whoever exposes himself to suspicion, let him blame only himself for whoever suspects him.
He who covers his secret is in a position to choose [to correct himself].
Assume the best about your brother until what comes to you from him overcomes you [and you have to change your opinion].
Never do you pay back someone who disobeys Allâh in his dealings with you with the likes of obeying Allâh in your dealings with him.
Take righteous brothers [as friends]; acquire them in plenty, for they are a beautification in prosperity and an aid during calamity.
Do not ask about what has not yet happened until it actually happens, for what has happened is enough of an occupation to worry about what has not happened.
Let not your speech be given freely except to those who want to hear it and will value it.
Do not seek help in fulfilling a need you have except from someone who wants success for you in that endeavor.
Do not consult except people who fear Allâh, and do not accompany the sinner, [lest]  you learn his sinfulness.
And be humble at the graves.

Abû Dâwûd, Kitâb Al-Zuhd article 89.

More:

1. ‘Alî, the Armor and the Christian
2. The Unfair Teacher
3. I’m the Man [the youngster who puts himself forward]
4. The scholar, the ruler, and your brother
5. Do not forget your character and speech

This is from Sayings of the Salaf - English translations of narrations from the Salaf - the earliest believers, our righteous predecessors, and true scholars of Islam. Selected and translated by Owais Al-Hashimi

Son of Adam! Know that the angel of death who has been assigned to you has not ceased to pass you and move on to others, ever since you have been in this world. But it is as if he is about to pass someone else and move on to target you, so be careful and prepare for him (by correcting your deeds). And do not forget him, for he does not forget you. And know o son of Adam, if you are heedless about yourself and do not prepare, no one else will prepare for you. You must meet Allah the Mighty and Majestic, so take for yourself and do not leave it to someone else. Peace be on you.

Abû Bakr Al-Daynûrî, Al-Mujâlasah wa Jawâhir Al-Ílm 2: 73, 74.

More:

1. Children of the Hereafter
2. Relying on some deeds, forgetting others
3. Dead Hearts and Empty Supplications
4. Abû Bakr to ‘Umar on his Deathbed
5. The Last Sermon of Caliph Umar b. Abd Al-Aziz

This is from Sayings of the Salaf - English translations of narrations from the Salaf - the earliest believers, our righteous predecessors, and true scholars of Islam. Selected and translated by Owais Al-Hashimi

O Abû Sa’îd, offer us some words you can benefit us with. He replied, “I will equip you with three words, then you must leave me to face what I am facing. Be the farthest of people from those things you have been forbidden, and be the most involved of people in the good you have been commanded to do; and know that the steps you take are two steps: a step in your favor and a step against you, so be careful where you come and where you go.”

Abû Na’yam, Hilyah Al-Awliyâ` 2:154

More:

1. Faith is not just in the heart [definition of Iman]
2. Accept the truth, whoever it comes from
3. Planting Nifâq
4. Weapons of Mass Distinction
5. Abû Bakr to ‘Umar on his Deathbed

This is from Sayings of the Salaf - English translations of narrations from the Salaf - the earliest believers, our righteous predecessors, and true scholars of Islam. Selected and translated by Owais Al-Hashimi

O Muslims, fear Allâh and obey Him, and accept the advice of the sincere advisers and the exhortation of the exhorters, and know that this knowledge is religion, so be careful about what you do [in it] and from whom you take [it] and who you follow and who you trust your religion to. For verily, the followers of Bid’ah are all falsifiers and liars, neither are they careful nor do they fear and protect [against wrongdoing], and nor are they to be trusted to not distort what you hear. They say what they know not when criticizing and decrying or when affirming their lies. But Allâh encompasses what they do. So be on guard against them, suspect them, reject them and distance yourselves from them, for this was what your earlier scholars and the righteous latter ones did and instructed others to do.

Beware of rising against Allâh and becoming instruments in the destruction of His religion and undoing its handholds by respecting the innovators, for you know what has come down to us about respecting them. And what stronger respect and veneration can there be than taking your religion from them, following them, believing them, being close to them and helping them in alluring those they allure and attracting those they attract of the weak Muslims towards their ideas and the religion they practice? This is enough to be considered a partnership and contribution to what they do.

Ibn ‘Asâkir, Târîkh Dimishq 6:361, 362.

More:

1. No poverty after Paradise and no wealth in the Fire
2. Risking your religion through Argumentation
3. Moderates who become Extremists
4. Ibn Mas’ud on the Companions [with notes on Bid'ah Hasanah]
5. I won’t be affected

This is from Sayings of the Salaf - English translations of narrations from the Salaf - the earliest believers, our righteous predecessors, and true scholars of Islam. Selected and translated by Owais Al-Hashimi

I advise you to fear Allâh and obey Him (taqwâ) and I advise you to adhere to the Quran, for it is a light in the dark night and a guidance during the day, so implement it no matter how much struggle and poverty you have to face. If a calamity befalls you, put your wealth forward to protect your religion, and if the calamity continues, put forward your wealth and your life to save your religion [but never risk your religion], for the ruined is he whose religion is ruined, and the looted is he whose religion is taken. And know that there is no poverty after Paradise, and no riches after the Fire.

Al-Dhahabî, Siyar A’lâm Al-Nubalâ` 3:174.

More:

1. Praise be to Allâh for this Calamity
2. The Last Sermon of Caliph Umar b. Abd Al-Aziz
3. Why People Invent Bid’ah
4. Abû Bakr to ‘Umar on his Deathbed
5. Imam Al-Awzai’s Letter of Warning against Heresy and Heretics

This is from Sayings of the Salaf - English translations of narrations from the Salaf - the earliest believers, our righteous predecessors, and true scholars of Islam. Selected and translated by Owais Al-Hashimi