Jabir ibn 'Abdullah al-Ansari reported that the Prophet, may Allah bless him and grant him peace, said, "Whoever has a favour done for him should repay it. If he cannot find anything he can use to repay it, he should praise the one who did it. When he praises him, he thanks him. If he is silent, he is ungrateful to him. If someone adorns himself with something he has not been given, it is as if he was wearing a false garment."

قَالَ النَّبِيُّ ﷺ 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

Ibn 'Umar reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Anyone who seeks refuge in Allah will find refuge with Him. Anyone who asks from Allah will be receive. Anyone who does a favour should repay it. If you do not find anything, then make supplication for the doer of the favour so that he knows that you have repaid him."

قَالَ رَسُولُ اللهِ ﷺ مَنِ اسْتَعَاذَ بِاللَّهِ فَأَعِيذُوهُ وَمَنْ سَأَلَ بِاللَّهِ فَأَعْطُوهُ وَمَنْ أَتَى إِلَيْكُمْ مَعْرُوفًا فَكَافِئُوهُ فَإِنْ لَمْ تَجِدُوا فَادْعُوا لَهُ حَتَّى يَعْلَمَ أَنْ قَدْ كَافَأْتُمُوهُ