Sacrifices were offered by the Patriarchs
Source: TTT
Genesis 22:2, 13
“Take your son,” God said, “your only son Isaac, whom you love, and go to the land of Moriah. Offer him there as a burnt offering on one of the mountains, which I will show you.” / Then Abraham looked up and saw behind him a ram in a thicket, caught by its horns. So he went and took the ram and offered it as a burnt offering in place of his son.
Genesis 31:54
Then Jacob offered a sacrifice on the mountain and invited his relatives to eat a meal. And after they had eaten, they spent the night on the mountain.
Genesis 46:1
So Israel set out with all that he had, and when he came to Beersheba, he offered sacrifices to the God of his father Isaac.
Job 1:5
And when the days of feasting were over, Job would send for his children to purify them, rising early in the morning to offer burnt offerings for all of them. For Job thought, “Perhaps my children have sinned and cursed God in their hearts.” This was Job’s regular practice.