500
Describe the incident of the argument of the 2 sons of Adam (AS)
Qaabil, the older son, wanted to marry his sister that Haabil, the younger son, was supposed to marry, they decided to have a sacrifice for the sake of Allah (SWT) to decide who would marry her, the sacrifice of Haabil was accepted and this enraged Qaabil and he killed Haabil, then Allah (SWT) sent 2 crows, one killed the other, dug a grave, and buried the dead one, Qaabil wathced this and did the same with his brother