Moses was a type of messiah who mediated the old covenant between GOD and Israel.
Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator. Galatians 3:19
And Moses took the blood, and sprinkled it on the people, and said, Behold the blood of the covenant, which the LORD hath made with you concerning all these words. Exodus 24:8
1 Timothy 2:5 refers to the new covenant.
Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator. Galatians 3:19
And Moses took the blood, and sprinkled it on the people, and said, Behold the blood of the covenant, which the LORD hath made with you concerning all these words. Exodus 24:8
1 Timothy 2:5 (KJV)
[SUP]5 [/SUP]For there is one God, and one mediator between God and men, the man Christ Jesus;
Hebrews 12:23-24 (KJV)
[SUP]23 [/SUP]To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect,
[SUP]24 [/SUP]And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel.
Jesus also covers the sins of those of the Old Covenant who had faith in God, and trusted Him.
Hebrews 9:15 (KJV)
[SUP]15 [/SUP]And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance.
I think that we might be splitting hairs in speaking covenant, and testament. In the respect that I speak, I categorize them as the same. Nevertheless, a testament is equated with death, and a covenant is equated with promise.