Genesis 35:7

He built an altar — And no doubt offered sacrifice upon it, perhaps the tenth of his cattle, according to his vow, I will give the tenth unto thee. And he called the place, That is, the altar, El — beth — el, the God of Beth — el. As when he made a thankful acknowledgement of the honour God had done him in calling him Israel, he worshipped God by the name of El — elohe — israel, so now he was making a grateful recognition of God's former favour at Beth — el, he worships God by the name of El — beth — el, the God of Beth — el, because there God appeared to him.