ScriptureCatholic.com has these OT verses regarding Tradition in the OT:
*Deut. 31:9-12 - Moses had the law read only every seven years. Was the word of God absent during the seven year interval? Of course not. The Word of God has always been given orally by God’s appointed ones, and was never limited to Scripture.
Isa. 40:8 - the grass withers, the flower fades, but the Word of our God (not necessarily written) will stand forever.
Isa. 59:21 - Isaiah prophesies the promise of a living voice to hand on the Word of God to generations by mouth, not by a book. This is either a false prophecy, or it has been fulfilled by the Catholic Church.
Joel 1:3 - tell your children of the Word of the Lord, and they tell their children, and their children tell another generation.
Mal. 2:7 - the lips of a priest guard knowledge, and we should seek instruction from his mouth. Protestants want to argue all oral tradition was committed to Scripture? But no where does Scripture say this.*