Answer:
The lamb was slaughter because ALLAH ALMIGHTY ordered his PROPHET HAZRAT IBRAHIM(A.S) to sacrifice his dearest thing(HAZRAT ISMAIL A.S) His son agreed with them Ibrahim (AS) did as Ismail (AS) had said. Blindfolded and with the knife in his hands, he did as Allah (SWT) had asked of him. When he took the blindfold off, to his surprise, he saw the body of a dead ram in front of him. Ismail (AS) was completely unharmed standing right next to him. At first, he thought that something had gone horribly wrong and that he had disobeyed the order of his Creator. But then he heard a voice telling him that Allah (SWT) looks after his followers and that he need not worry.
Explanation:
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