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It was narrated that Umar. (رضي الله عنه) said: The Messenger of Allah (ﷺ) said. “The likeness of the one who goes back his charity is that of one who goes back to his vomit.”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا هِشَامُ بْنُ سَعْدٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ أَبِيهِ، عَنْ عُمَرَ، رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَثَلُ الَّذِي يَعُودُ فِي صَدَقَتِهِ كَمَثَلِ الَّذِي يَعُودُ فِي قَيْئِهِ.
sunnah.com