Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Rabi’ bin Mu’awwiz (may Allah be pleased with him) that the Noble Prophet (peace and blessings of Allah be upon him) said: "When people offer the funeral prayer for a deceased person and praise him, Allah Almighty says: I have enforced the testimony of My servants based on the good deeds which they know, and I have forgiven the bad deeds which they do not know."