And recall when Abraham said: "My Lord, show me how You will restore life to the dead!" God said: "Why? Do you not believe?" Abraham said: "Yes, but that my heart may be at rest." He (his Lord) said: "Then take four of the birds (of different kinds), and tame them to yourself to know them fully. Then (cut them into pieces and mix the pieces with each other, and) put on every one of the hills a piece from each, and then summon them, and they will come to you flying. Know that surely God is All-Glorious with irresistible might, All-Wise.