1 Kings 2:4

and so that the Lord may fulfill His promise to me: ‘If your descendants take heed to walk faithfully before Me with all their heart and soul, you will never fail to have a man on the throne of Israel.’
BSB · Berean Standard Bible
That the Lord may continue his word which he spake concerning me, saying, If thy children take heed to their way, to walk before me in truth with all their heart and with all their soul, there shall not fail thee (said he) a man on the throne of Israel.

Note fail…: Heb. be cut off from thee from the throne

KJV · King James Version
Then the Lord may establish his word which he spoke concerning me, saying, ‘If your children are careful of their way, to walk before me in truth with all their heart and with all their soul, there shall not fail you,’ he said, ‘a man on the throne of Israel.’
WEB · World English Bible
that Jehovah may establish his word which he spake concerning me, saying, If thy children take heed to their way, to walk before me in truth with all their heart and with all their soul, there shall not fail thee (said he) a man on the throne of Israel.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

That the Lord
Genesis 18:19; Deuteronomy 7:12; 1 Chronicles 28:9; John 15:9, 10; Jude 1:20, 21, 24
his word
2 Samuel 7:11–16, 25; 1 Chronicles 17:11–15; 1 Chronicles 22:9–11; 1 Chronicles 28:5–7; Psalm 89:29–37; Psalm 132:11, 12
walk
1 Kings 3:3, 14; 1 Kings 8:23; Genesis 17:1; Leviticus 26:3; 2 Kings 20:3; 2 Kings 23:3, 25; 2 Chronicles 17:3; Luke 1:6
with all their heart
Deuteronomy 6:5; Deuteronomy 10:12; Deuteronomy 11:13; Matthew 22:37
fail, etc. Heb. be cut off from thee from the throne
1 Kings 8:25; 2 Samuel 7:12, 13, 16; Psalm 37:9, 22; Zechariah 14:2