A Tzadik Decrees And Hashem Fulfills in The Merit of His Chesed:
Sefer Imrei Noam writes that we see from this verse that through doing chesed, one can reach a level of “a tzadik decrees and Hashem fulfills.”
This is like what is stated (Mishlei 19:17): “He who is gracious to a poor man lends to Hashem, and He will repay him his reward.” Chazal say on this pasuk (Bava Basra 10A) that if a person lends money to a poor man in his time of need, it is like he is lending money to Hashem. The pasuk also says (Mishlei 22:7): “The borrower is a servant to the lender.” Therefore, Hashem is “required” to fulfill the will of the baal chesed and do as he decrees.
This is also seen from the story in the Gemara (Brachos 7A) of how Yishmoel the Kohen Gadol saw Hashem’s name of ‘Akasrie-il”, which said to him, “Yishmoel my son, bless me (barcheini).”
The word “barcheini” can also be a reference to a “knee” (as in “v’chol berech lecha sichra, every knee will bend before you). This indicates that Hashem was telling him that because he was a Kohein Gadol who did chesed, he had the ability to make Hashem “bend His knee” to him, so to speak, and fulfill whatever he decreed.
So too, when the pasuk says that Hashem blessed (beirach) Avrohom, it can be understood to mean that Hashem “bent His knee” to Avrohom and fulfilled whatever he requested.
Eliezer told Besuel and Lavan that he wanted to see if Rivkah did chesed because acts of chesed are so powerful that they can annul Divine decrees. Before saying this, however, he began by explaining the greatness of Avrohom. The pasuk says: “Vayomer” (and he said), I am a servant of Avrohom.” The Zohar Hakadosh (Chelek 1, 102B) says that when the word “vayomer” is used without explicitly saying who is talking, it is a reference to Hashem. Thus, the pasuk can be understood to mean that “Hashem said that He is a servant of Avrohom”, as He did whatever Avrohom decreed in the merit of his chesed, and He blessed “beirach” Avrohom “with everything”, meaning that he did whatever he asked.
