Exodus 9:10
9:10 So they took soot from a furnace and stood before Pharaoh, Moses threw it into the air, and it caused festering boils to break out on both people and animals.
Exodus 19:18
19:18 Now Mount Sinai was completely covered with smoke because the Lord had descended on it in fire, and its smoke went up like the smoke of a great furnace, 1 and the whole mountain shook 2 violently.
1 sn The image is that of a large kiln, as in Gen 19:28.
2 tn This is the same word translated “trembled” above (v. 16).