In 2 Samuel 22:51, David sings that God shows steadfast love to his anointed and his descendants forever—directly affirming the blessing he prays for here.

1 Chronicles 17:27 is the parallel account of David's prayer, nearly identical, asking God to bless his house forever.

1 Kings 2:12 shows Solomon firmly established on David's throne—the concrete fulfillment of David's prayer for his house to continue forever.

1 Kings 8:15 has Solomon blessing God for fulfilling his promise to David—directly referencing the covenant that underlies David's prayer here.

1 Kings 11:36 promises a lamp for David in Jerusalem despite judgment—showing God's ongoing commitment to David's house as prayed for here.

Psalm 89:4 quotes God's promise to establish David's throne forever—the very promise David is clinging to in this prayer.