And Jacob was left alone. And a man wrestled with him until the breaking of the day. When the man saw that he did not prevail against Jacob, he touched his hip socket, and Jacob’s hip was put out of joint as he wrestled with him. Then he said, “Let me go, for the day has broken.” But Jacob said, “I will not let you go unless you bless me.” And he said to him, “What is your name?” And he said, “Jacob.” Then he said, “Your name shall no longer be called Jacob, but Israel, for you have striven with God and with men, and have prevailed.” Then Jacob asked him, “Please tell me your name.” But he said, “Why is it that you ask my name?” And there he blessed him. So Jacob called the name of the place Peniel, saying, “For I have seen God face to face, and yet my life has been delivered.”

Genesis 32:24

All that open the womb are mine, and every firstling of your cattle born a male, ox or sheep. The firstborn of a donkey you shall redeem with a lamb, or if you will not redeem it you shall break its neck. All the firstborn of your sons you shall redeem. And none shall appear before me empty-handed.

Exodus 34:19

Isaac was the first born Jew of the original covenant, and thus had to be offered to God. Fortunately he was redeemed by a ram (click the image to see the full version). God will provide for us, though we must trust him.