Matthew 18:13
And if so be that he find it, verily I say unto you, he rejoiceth more of that sheep, than of the ninety and nine which went not astray.
Cross-references
Jeremiah 32:41 says God rejoices to do good to His gathered people — mirroring the shepherd's joy over the restored sheep.
Zephaniah 3:17 pictures God exulting over His people with loud singing — the same joy as the shepherd's over the found sheep.
Luke 15:5-10 recounts the same lost sheep parable, emphasizing heaven's joy over one repentant sinner.
Luke 15:24 explicitly states 'he was lost and is found' — directly echoing the theme of the lost sheep being found.
In Psalm 119:176, the psalmist prays 'seek your servant' as a lost sheep — this plea is answered by the shepherd's joyful recovery.
Ezekiel 34:4 condemns shepherds who did not seek the lost — the opposite of the rejoicing shepherd here who goes after the stray.
Luke 15:4 tells the same parable of the shepherd leaving the ninety-nine to find the lost sheep — a direct parallel account.
Luke 15:7 applies the parable: heaven rejoices more over one repentant sinner — the same joy as the shepherd finding the sheep.
Deuteronomy 22:1 commands returning a neighbor's stray sheep — a parallel duty to the shepherd's own pursuit of his lost sheep.