​ANSWER:  The Lutheran Study Bible lists five occasions where Genesis 15:6 is quoted in the New Testament: Paul uses it three times in the fourth chapter of Romans (vv. 3, 9, 22) and once in Galatians (3:6), and James uses it once (2:23).
 
Note: In Luther’s Small Catechism Genesis 15:6 is the first of three verses used to support the answer the question, “How do you receive this forgiveness of sins?”. The two other verses are Romans 3:28 and Romans 4:5.
 
The answer to the catechism question is, “I receive this forgiveness through faith, that is, by believing the Gospel.”
 
Note: Additional Scripture that supports the catechism answer include John 3:16; Romans 1:16, 10:4; Galatians 3:13; and Colossians 1:13-14.
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​Read Romans 4

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Saint Paul the "apostle to the Gentiles" (Gal 2:8)

"Saint Paul Writing His Epistles" by Valentin de Boulogne (c. 1618-1620)

"Saint Paul" by ​Bartolomeo Montagna (1482)