Hadith on Gratitude: Thank those who do you favors

Jabir ibn Abdullah reported: The Prophet, peace and blessings be upon him, said, “Whoever is treated well, let him repay them. If he cannot find repayment, let him praise them for that is thanking them. If he conceals it, he was been ungrateful to them. Whoever adorns himself with what he has not been given, it is as if he wears a garment of lies.”

Source: al-Adab al-Mufrad 215

Grade: Sahih (authentic) according to Al-Albani

عَنْ جَابِرِ بْنِ عَبْدِ اللهِ قَالَ‏ قَالَ النَّبِيُّ صلى الله عليه وسلم‏ مَنْ صُنِعَ إِلَيْهِ مَعْرُوفٌ فَلْيُجْزِئْهُ فَإِنْ لَمْ يَجِدْ مَا يُجْزِئُهُ فَلْيُثْنِ عَلَيْهِ فَإِنَّهُ إِذَا أَثْنَى فَقَدْ شَكَرَهُ وَإِنْ كَتَمَهُ فَقَدْ كَفَرَهُ وَمَنْ تَحَلَّى بِمَا لَمْ يُعْطَ فَكَأَنَّمَا لَبِسَ ثَوْبَيْ زُورٍ‏

215 الأدب المفرد البخاري باب من صنع إليه معروف فليكافئه

157 المحدث الألباني خلاصة حكم المحدث صحيح في صحيح الأدب المفرد