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”
Sahih Isnaad MaqtuSahih Isnaad MaqtuIsnaad HasanBook 24 · Hadith 145