‏الهبات : Hadeeth No:3962 Nu'man b. Bashir reported: My father brought me to Allaah's Messenger (sallAllaahu alayhi wa sallam) and said: I have donated this slave to my son. whereupon he said: Have you made (such) donation to every one or your sons? He said: No. Thereupon he (the-Prophet) said: Then take him back....

‏البيوع : Hadeeth No:3714 Jabir b. Abdullah (Allaah be pleased with them) reported that Allaah's Messenger (sallAllaahu alayhi wa sallam) forbade leasing of land, and selling ahead for years and selling of fruits before they become ripe....