Abdur Rahman bin 'Amr al-Awza'i عبد الرحمن بن عمرو أبو عمرو الأوزاعي · The Book of 'Umra

"Do not give things on the basis of Ruqba or 'Umra. Whoever is given something on the basis of Ruqba or 'Umra, it belongs to his heirs."

"Habib bin Abi Thabit informed us from Ibn 'Umar, that the Messenger of Allah said: 'There is no 'Umra and no Ruqba. Whoever is given something on the basis of 'Umra or Ruqba, it belongs to him for the rest of his life and after he dies.'"

'Ata' informed me, from Habib bin Abi Thabit, from Ibn 'Umar -and he did not hear it from him- he said: 'Allah's Messenger said: "There is no 'Umra and no Ruqba. Whoever is given something on the basis of 'Umra or Ruqba, it belongs to him for the rest of his life and after he dies."' 'Ata' said: "It belongs to the other."