Albert Barnes on Matthew 22:30

Neither marry, etc. This was a full answer to the objections of the Sadducees.

But are as the angels of God. That is, in the manner of their intercourse; in regard to marriage, and the mode of their existence, Luke adds, that they shall be "equal to the angels;" that is, they shall be elevated above the circumstances of mortality, and live in a manner, and in a kind of intercourse, equal to the angels. It does not imply that they shall be equal in intellect, but only in the circumstances of their existence, as that is distinguished from the way in which mortals live. He also adds, "Neither can they die any more: but are the children of God, being the children of the resurrection," Lk 20:36 or being accounted worthy to be raised up to life, and therefore sons of God raised up to him.

(f) "angels of God" Mt 18:10, 1Jn 3:2