The Messenger of Allah ﷺ said, "Whoever does not thank people has not thanked Allah."
قال رسول الله ﷺ: من لم يشكر الناس لم يشكر الله.
No references are available.
Tabarani reported it in Al-Kabir (2/408) from Muhammad bin Abdullah Hadrami, who said, Uthman bin Abu Shayba narrated to us, who said, Yahya bin Adam narrated to us, who said, Israil narrated to us, from Abu Ishaq, from Jareer, and he mentioned it. Its chain of transmission is sahih. Haythami said in Al-Majma (8/181), "Its narrators are the narrators of the Sahih."