The Prophet ﷺ said, "Whoever does not thank people has not thanked Allah."
حدثنا عفان قال حدثنا الربيع بن مسلم حدثنا محمد بن زياد
أن النبي ﷺ قال لا يشكر الله من لا يشكر الناس
No references are available.
Its isnad is sahih. It has occurred previously at . It was also related by Abu Dawud in "Manners" 4/255 no. 4811, by Bukhari in "Manners" 88 no. 218, and by Tabarani in Kabir 1/195 no. 519.