Abraham planted a grove, not so much for shade, which yet was pleasant and necessary in these hot regions, as for religious use, that he might retire thither from the noise of worldly business, and freely converse with his Maker. Which practice of his was afterwards abused to superstition and idolatry, for which reason groves were commanded to be cut down. See Deuteronomy 12:3, Deuteronomy 16:21. Called there on the name of the Lord. He thankfully acknowledging God's great goodness in giving him the favour and friendship of so great and worthy a prince and neighbour.
Related Commentaries of Genesis 21:33
Genesis 21:33
33 And Abraham planted a groveb in Beersheba, and called there on the name of the LORD, the everlasting God.