Teach but do not Pretend

Ibn Al-Muhallab reports that he heard Abȗ Mȗsâ Al-Ash’arî – Allah be pleased with him – standing on his minbar (pulpit) saying:

Whoever Allâh has given some knowledge should teach it. And he must not say anything he has no knowledge of, lest he become one of the pretenders and leave the religion.

Ibn Sa’d, Al-Tabaqât 4:102. Maktabah Al-Khânjî, Cairo.

More towards the end

It is reported that before his death, Abû Mûsâ Al-Ash’arî – Allah be please with him – used to exert himself intensely in worship. It was said to him, “If only you would slow down and go easy on yourself.” He replied, “When steeds are let loose and come close to the end of their course they finish by giving it all they have, and what remains of my life is less than that.”

Al-Dhahabî , Siyar A’lâm Al-Nubalâ` in his biography of Abû Mûsâ Al-Ash’arî.

The Knowledge of ‘Â`ishah

It is reported from Abû Mûsâ Al-Ash’arî – Allah be pleased with him – that he said:

We the Companions of Allah’s Messenger – Allah’s peace and blessings be upon him – never had difficulty in understanding a hadîth except that when we asked ‘Â`ishah we found she had some knowledge about it.

It is reported from Masrûq – Allah have mercy on him – that he said:

We swear by Allah, we have seen senior Companions of Allah’s Messenger – Allah’s peace and blessings be upon him – asking ‘Â`ishah about inheritance laws.

Ibn Al-Jawzî, Sifah Al-Safwah Vol.1 p319.