וְאַבְרָהָ֣ם זָקֵ֔ן בָּ֖א בַּיָּמִ֑ים וַֽיהוָ֛ה בֵּרַ֥ךְ אֶת־אַבְרָהָ֖ם בַּכֹּֽל׃
און אבֿרהם איז געװאָרן אַלט און באַטאָגט; און גאָט האָט געבענטשט אבֿרהמען מיט אַלצדינג.
Rashi
ברך את אברהם בכל [THE LORD HAD] BLESSED ABRAHAM IN ALL THINGS — The numerical value of the word בכל is equal to that of בן (a son) — suggesting that God had blessed Abraham with a son and since he had a son he had to find him a wife.
Chizkuni
ואברהם זקן, “and by now Avraham had visibly aged;” he could no longer move around easily, and that is why he sent his servant (to select a bride for Yitzchok).
Da'at Zekenim
ברך את אברהם בכל, “He blessed Avraham in all respects.” This was due to the merit he had acquired when tithing the loot of the war against the Kings with Kedorleomer and giving it to the “priest,” who was the King of Shalem. (Genesis 14,20)