Found 2 verses containing down payment in Paul's Epistles (Romans - Philemon).
Showing both verses.

2 Corinthians 1:22 (Show me 2 Corinthians 1)
and who has also put his seal on us and given us his Spirit in our hearts as a guarantee.[1]
[1]Or down payment

Ephesians 1:14 (Show me Ephesians 1)
who is the guarantee[1] of our inheritance until we acquire possession of it,[2] to the praise of his glory.
[1]Or down payment [2]Or until God redeems his possession