The books themselves claim to have been written by Moses (Ex. 24:4,7; 34:27-28; Nu. 33:2; De. 1:1-5; 4:4-5; 31:9-12,24-26). If Moses did not write the Pentateuch, the Bible is llying from its beginning.

Other Old Testament. books claim Moses wrote the Pentateuch (Jos. 1:7; 8:30-35; Ju. 3:4; 1 Ki. 2:3; 2 Ki. 14:6; 22:8-11; 23:21-25; Ezr. 3:2; Ne. 8:1; 9:14; Da. 9:11; Mal. 4:4). If Moses did not write the Pentateuch, all of these writers are also lying.

The New Testament claims Moses wrote the Pentateuch. Moses is mentioned 80 times in the New Testament (Mk. 12:26; Lk. 16:29-31; 24:27 [Moses’ writings are called Scripture]; 24:44; Jn. 1:17; 5:45-47; 8:5; Ac. 15:21; 2 Co. 3:15).

The Lord Jesus Christ quotes from every part of the Pentateuch: Genesis (Mt. 19:4-6; 24:37-39); Exodus (Mk. 12:26 citing Ex. 3:6); Leviticus (Mt. 8:4 citing Lev. 14:1-32); Numbers (Jn. 3:14-15 citing Num. 21:8,9 and Jn. 6:31-32 citing Num. 11:6-9); Deuteronomy (Mk. 10:4-5 citing Deut. 24:1).  he also refers to Moses stating certain things on marriage and divorce, Noah and other events in Genesis which validates that Moses spoke the truth in these books.