This reading is from the special Torah portion read on the Shabbat during the festival of Sukkot. The complete reading for the intermediate Shabbat is Exodus 33:12-34:26.
The Lord said to Moses: "Carve two tablets of stone like the first, and I will inscribe upon the tablets the words that were on the first tablets, which you shattered. Be ready by morning, and in the morning come up to Mount Sinai and present yourself there to Me, on the top of the mountain. No one else shall come up with you, and no one else shall be seen anywhere on the mountain; neither shall the flocks and the herds graze at the foot of this mountain."
So Moses carved two tablets of stone, like the first, and early in the morning he went up on Mount Sinai, as the Lord had commanded him, taking the two stone tablets with him. The Lord came down in a cloud; He stood with him there, and proclaimed the name Lord.