Musar do Rodzaju 13:4

The first quality: Know that the love of Abraham, peace be upon him, was to teach all those who came into the world the service of the Creator, blessed be He, and proclaim His name always, as it is said (Genesis 13:4), “And Abraham called there on the name of the Lord.” It is also said (ibid., 12:8), “And he built an altar unto the Lord, Who appeared unto him.” And it is said (ibid., 21:33), “And Abraham planted a tamarisk tree in Beersheba and called there on the name of the Lord.” These verses are to let you know that every place that Abraham went he would call on the name of the Lord and would occupy himself with service to Him. He was not restrained from doing so by the fear of the nations of the world.