" لاَ تُرْقِبُوا وَلاَ تُعْمِرُوا فَمَنْ أُرْقِبَ أَوْ أُعْمِرَ شَيْئًا فَهُوَ لِوَرَثَتِهِ "
Sufyan narrated from Ibn Juraij, from 'Ata', from Jabir that the Messenger of Allah said: "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."