That they may witness things that are of benefit to them (i.e. reward of Hajj in the Hereafter, and also some worldly gain from trade, etc.), and mention the Name of Allah on appointed days (i.e. 10th, 11th, 12th, and 13th day of Dhul-Hijjah), over the beast of cattle that He has provided for them (for sacrifice) (at the time of their slaughtering by saying: Bismillah, WAllahu-Akbar, Allahumma Minka wa Ilaik). Then eat thereof and feed therewith the poor who have a very hard time.