It is narrated from Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him); he said: A man said in the presence of the Messenger of Allah (peace and blessings be upon him): "Al-hamdu lillahi kathiran tayyiban mubarakan fih" (All praise is for Allah, abundant, pure and blessed praise). The Messenger of Allah (peace and blessings be upon him) said: "Who said these words?" The man fell silent, thinking that the Messenger of Allah (peace and blessings be upon him) had come upon something he disliked. The Messenger of Allah (peace and blessings be upon him) said: "Who is he? For he said nothing but what is right." The man said: O Messenger of Allah, I said it, hoping for good by it. He (peace and blessings be upon him) said: "By the One in whose Hand is my soul, I saw thirteen angels racing one another to take up these words of yours (to Allah), each trying to be the one to raise them to Allah, the Blessed and Exalted."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4073