and he said unto me, "My grace is sufficient for thee. For my strength is made perfect through weakness." Very gladly therefore will I rejoice of my weakness, that the strength of Christ may dwell in me.

Forty days

And Moses went into the mountain. And Moses was in the mount forty days and forty nights.

And he was there with the LORD forty days and forty nights, and neither ate bread nor drank water. And he wrote in the tables the words of the covenant: even ten verses.

after that I was gone up into the mount, to fetch the tables of stone, the tables of covenant which the LORD made with you. And I abode in the hill forty days and forty nights and neither ate bread nor drank water.

And when he had fasted forty days and forty nights, he was afterward a hungered.

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

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

Horeb

Moses kept the sheep of Jethro his father-in-law, priest of Midian, and he drove the flock to the backside of the desert, and came to the mountain of God, Horeb.

And mount Sinai was altogether on a smoke: because the LORD descended down upon it in fire. And the smoke thereof ascended up, as it had been the smoke of a kiln, and all the mount was exceeding fearful.

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

General references

And Jethro, Moses' father-in-law, came with his two sons and his wife unto Moses into the wilderness: where he had pitched his tent by the mount of God.