Musnad Abi Ya'la 3100 — a man entered the mosque while the Prophet ﷺ

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that a man entered the mosque while the Prophet (peace and blessings be upon him) was leading the prayer, and he said: 'Al-hamdu lillahi tayyiban mubarakan fih' (To Allah alone belongs praise, pure and blessed). When the Prophet (peace and blessings be upon him) completed the prayer, he said: "Which of you said these words?" The people remained silent three times; then a man said: "I said them, and I intended nothing but good by them." He (peace and blessings be upon him) said: "Twelve angels raced one another to write these words, but they did not know how to write them, until they asked their Lord, and He said: 'Write them just as My servant said them.'"