ßÊÇÈ ÇáåÈÉ æÝÖáåÇ : Hadeeth No:2466 : 'Umar bin Al-Khatab: Once I gave a horse (for riding) in Allah's Cause. Later I saw it being sold. I asked Allah's Apostle (whether I could buy it). He said, "Don't buy it, for you should not get back what you have given in charity."...

ßÊÇÈ ÇáäßÇÍ : Hadeeth No:4803 : Ibn 'Umar: The Prophet decreed that one should not try to cancel a bargain already agreed upon between some other persons (by offering a bigger price). And a man should not ask for the hand of a girl who is already engaged to his Muslim brother, unless the first suitor gives her up, ...