'Leg' in the Bible

And Abraham said to his chief servant, the manager of all his property, Come now, put your hand under my leg:

And the servant put his hand under Abraham's leg, and gave him his oath about this thing.

But when the man saw that he was not able to overcome Jacob, he gave him a blow in the hollow part of his leg, so that his leg was damaged.

And while he was going past Peniel, the sun came up. And he went with unequal steps because of his damaged leg.

For this reason the children of Israel, even today, never take that muscle in the hollow of the leg as food, because the hollow of Jacob's leg was touched.

And the time of his death came near, and he sent for his son Joseph and said to him, If now I am dear to you, put your hand under my leg and take an oath that you will not put me to rest in Egypt;