'Theirs' in the Bible

“Blessed [spiritually prosperous, happy, to be admired] are the poor in spirit [those devoid of spiritual arrogance, those who regard themselves as insignificant], for theirs is the kingdom of heaven [both now and forever].

“Blessed [comforted by inner peace and God’s love] are those who are persecuted for doing that which is morally right, for theirs is the kingdom of heaven [both now and forever].

Not only [did they give materially] as we had hoped, but first they gave themselves to the Lord and to us [as His representatives] by the will of God [disregarding their personal interests and giving as much as they possibly could].

having become as much superior to angels, since He has inherited a more excellent and glorious name than they [that is, Son—the name above all names].