to the site of the altar that he had built there at first; and there Avram invoked Hashem by name.
Radak on Genesis 13:4
English: To the site of the altar that he had made there at first — he returned to the place of his first prayer. This teaches that a person should establish a fixed place for prayer and worship, where familiarity helps concentration.
Supplementary classical material not listed by Torah Temimah under this exact passuk.