حَدَّثَنَا أَحْمَدُ بْنُ حَنْبَلٍ، حَدَّثَنَا هُشَيْمٌ، أَخْبَرَنَا دَاوُدُ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، قَالَ قَالَ رَسُولُ صلى الله عليه وسلم ‏"‏ الْعُمْرَى جَائِزَةٌ لأَهْلِهَا وَالرُّقْبَى جَائِزَةٌ لأَهْلِهَا ‏"‏ ‏.‏

Mujahid said

'Umra' means that a man says to another man: It belongs to you so long as you live. When he says that, it belongs to him and to his heirs. Ruqba means that a man says to another: From me and from you.