And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me.

Forty days

And Moses went into the midst of the cloud, and gat him up into the mount: and Moses was in the mount forty days and forty nights.

And he was there with the LORD forty days and forty nights; he did neither eat bread, nor drink water. And he wrote upon the tables the words of the covenant, the ten commandments.

When I was gone up into the mount to receive the tables of stone, even the tables of the covenant which the LORD made with you, then I abode in the mount forty days and forty nights, I neither did eat bread nor drink water:

And when he had fasted forty days and forty nights, he was afterward an hungred.

And he was there in the wilderness forty days, tempted of Satan; and was with the wild beasts; and the angels ministered unto him.

Being forty days tempted of the devil. And in those days he did eat nothing: and when they were ended, he afterward hungered.

Horeb

Now Moses kept the flock of Jethro his father in law, the priest of Midian: and he led the flock to the backside of the desert, and came to the mountain of God, even to Horeb.

And mount Sinai was altogether on a smoke, because the LORD descended upon it in fire: and the smoke thereof ascended as the smoke of a furnace, and the whole mount quaked greatly.

Remember ye the law of Moses my servant, which I commanded unto him in Horeb for all Israel, with the statutes and judgments.

General references

And Jethro, Moses' father in law, came with his sons and his wife unto Moses into the wilderness, where he encamped at the mount of God: