Genesis 17:9 And God said unto Abraham, Thou shalt keep my covenant therefore, thou, and thy seed after thee in their generations. 10 This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.
[Patriarchs & Prophets pp 138] At this time the rite of circumcision was given to Abraham as “a seal of the righteousness of the faith which he had yet being uncircumcised.” Romans 4:11. It was to be observed by the patriarch and his descendants as a token that they were devoted to the service of God and thus separated from idolaters, and that God accepted them as His peculiar treasure. By this rite they were pledged to fulfill, on their part, the conditions of the covenant made with Abraham.
They were not to contract marriages with the heathen; for by so doing they would lose their reverence for God and His holy law; they would be tempted to engage in the sinful practices of other nations, and would be seduced into idolatry. God conferred great honor upon Abraham. Angels of heaven walked and talked with him as friend with friend. When judgments were about to be visited upon Sodom, the fact was not hidden from him, and he became an intercessor with God for sinners. His interview with the angels presents also a beautiful example of hospitality.
In the hot summer noontide the patriarch was sitting in his tent door, looking out over the quiet landscape, when he saw in the distance three travelers approaching. Before reaching his tent, the strangers halted, as if consulting as to their course. Without waiting for them to solicit favors, Abraham rose quickly, and as they were apparently turning in another direction, he hastened after them, and with the utmost courtesy urged them to honor him by tarrying for refreshment. With his own hands he brought water that they might wash the dust of travel from their feet.
Genesis 18:1 And the Lord appeared unto him in the plains of Mamre: and he sat in the tent door in the heat of the day; 2 And he lift up his eyes and looked, and, lo, three men stood by him: and when he saw them, he ran to meet them from the tent door, and bowed himself toward the ground.
May The Lord add His blessing to the study of His word. God bless!