It is reported that ‘Abdullâh b. Mas’ûd – Allâh be pleased with him – said, “One of the worst sins is when a man says to his brother, “Fear Allâh,’ and he replies, “Worry about yourself.”

Abû Bakr Al-Daynûrî, Al-Mujâlasah wa Jawâhir Al-‘Ilm article 2619.