LXX Deuteronomy 33:4
2 And he said, The Lord is come from Sina, and has appeared from Seir to us, and has hasted out of the mount of Pharan, with the ten thousands of Cades; on his right hand were his angels with him. 3 And he spared his people, and all his sanctified ones are under thy hands; and they are under thee; and he received of his words 4 the law which Moses charged us, an inheritance to the assemblies of Jacob. 5 And he shall be prince with the beloved one, when the princes of the people are gathered together with the tribes of Israel. 6 Let Ruben live, and not die; and let him be many in number.
Sirach 24:23
Ben Sira, Ecclesiasticus22 Whoever obeys me will not be put to shame, and those who work with me will not sin." 23 All this is the book of the covenant of the Most High God, the law that Moses commanded us as an inheritance for the congregations of Jacob. 25 It overflows, like the Pishon, with wisdom, and like the Tigris at the time of the first fruits. 26 It runs over, like the Euphrates, with understanding, and like the Jordan at harvest time. 27 It pours forth instruction like the Nile, like the Gihon at the time of vintage.
Notes and References
"... Scholars have identified Ben Sira’s scriptural corpus as some unified form of at least the Torah and Prophets. Ben Sira frequently mentions the term Law to refer to divine commandments generally (Sirach 32:24; 33:2; 41:8). Nevertheless, throughout his book he at times refers to νόμος ('law') to indicate a specific writing that he considered to be divine Scripture: All these things are the book of the covenant of the Most High God, the law that Moses commanded as an inheritance for the congregation of Jacob. (Sirach 24:23) While Ben Sira elsewhere refers generally to the Mosaic covenant linked to a law of the Most High (Sirach 42:2; 44:20), here he makes explicit that this law is linked to an explicit book. This book is some early version of the Hebrew Pentateuch. This reliance on a version of the Mosaic Torah is strengthened by the fact that Sirach 24:23 appears to be an almost verbatim citation of LXX Deuteronomy 33:4. While one cannot know the exact text-form used by Ben Sira, this indicates that there was a written form of the Mosaic Torah/Law that was regarded as scriptural or authoritative for the children of Israel ..."
Beckman, Peter Ben Sira’s Canon Conscious Interpretive Strategies: His Narrative History and Realization of the Jewish Scriptures (pp. 562-575) Themelios, Vol. 46, Issue 3, 2021