Sunan an-Nasa'i 3737
سنن النسائي#3737SahihHisham narrated from Abu Az-Zubair, from Jabir, that the Messenger of Allah said:"Hold on to your wealth and do not give it on the basis of 'Umra. For whoever is given something on the basis of 'Umra for the rest of his life, it belongs to him for the rest of his life and after his death
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 34:19