Because that Abraham obeyed my voice, and kept my charge, my commandments, my statutes, and my laws.
Genesis 26:5
Abraham was a great father of many people: in glory was there none like unto him;
Who kept the law of the most High, and was in covenant with him: he established the covenant in his flesh; and when he was proved, he was found faithful.
Sirach 44:19-20
Was not Abraham found faithful in temptation, and it was imputed unto him for righteousness?
1 Maccabees 2:52