Consider that Abraham and Sarah were “foreigners and visitors” in the land of their sojourning, and they had no place of their own to lay their head, until their head was laid to rest in burial. Jesus said of Himself, “Foxes have holes and birds of the air have nests, but the Son of Man has nowhere to lay His head,” (Mat 8:20), that is, until His head was laid to rest in burial.
We have already seen that Isaac, as the son of the promise, is an Old Testament type for Messiah, the Promised Seed. In Gen 24, Abraham (the Father) sends his servant (a.k.a. the Holy Spirit) to search for the bride (the Church) of Isaac (the Promised Seed, the Son). This event occurs AFTER the “death and resurrection” of the Promised Seed in Gen 22. In the end, the Holy Spirit, I mean, the servant, brings the Bride to the Son, as the Son goes out to meet them.
And Abraham gave all that he had to Isaac. Gen 25:5
Abraham had other sons, as this chapter makes clear. Ishmael by Hagar was Abraham’s firstborn, then Isaac by Sarah, then six more sons by Keturah. And since in Gen 25:6, “concubines” is plural, there may be other sons as well (vs. 6) which are not named. But Abraham as a prophetic type of the Father caused only one son, Isaac, as a prophetic type for the only begotten Son, the son of the promise, to inherit all he had, just as Messiah as the only begotten Son is the inheritor of all that is the Father’s:
“I will declare the decree:
The Lord has said to Me,
‘You are My Son,
Today I have begotten You.
Ask of Me, and I will give You
The nations for Your inheritance,
And the ends of the earth for Your possession.” Psa 2:7-8