Who gave the law to Moses?

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Moses received the law directly from God.

And the LORD came down upon mount Sinai, on the top of the mount: and the LORD called Moses up to the top of the mount; and Moses went up. . . . And the LORD said unto Moses, Thus thou shalt say unto the children of Israel, Ye have seen that I have talked with you from heaven. Exodus 19:20, 20:22

Angels gave the law to Moses through the hand of a mediator.

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