Ben Sira 44:20

20 He kept the law of the Most High, and entered into a covenant with him; he certified the covenant in his flesh, and when he was tested he proved faithful.

Ben Sira 44:20 In-Context

18 Everlasting covenants were made with him that all flesh should never again be blotted out by a flood.
19 Abraham was the great father of a multitude of nations, and no one has been found like him in glory.
20 He kept the law of the Most High, and entered into a covenant with him; he certified the covenant in his flesh, and when he was tested he proved faithful.
21 Therefore the Lord assured him with an oath that the nations would be blessed through his offspring; that he would make him as numerous as the dust of the earth, and exalt his offspring like the stars, and give them an inheritance from sea to sea and from the Euphrates to the ends of the earth.
22 To Isaac also he gave the same assurance for the sake of his father Abraham. The blessing of all people and the covenant