It is narrated from Hazrat Ash'ath (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: The most grateful servant to Allah is the one who is most grateful to people.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 21846
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف الجهالة عبدالرحمن بن عدي