Jesus says that Angels do not marry. Luke 20:35,36. Two of the characteristics [there are doubtless many more] of being "equal to the angels" is to not marry and to be immortal.
Luke 20:35,36 But they which shall be accounted worthy to obtain that world, and the resurrection from the dead, neither marry, nor are given in marriage: Neither can they die any more: for they are equal unto the angels; and are the children of God, being the children of the resurrection.
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