In the story Sinai was enveloped in a cloud,[7] it quaked and was filled with smoke,[8] while lightning-flashes shot forth, and the roar of thunder mingled with the blasts of a trumpet;[7] the account later adds that fire was seen burning at the summit of the mountain.[9] In the biblical account, the fire and clouds are a direct consequence of the arrival of God upon the mountain.[10] According to the biblical story, Moses departed to the mountain and stayed there for 40 days and nights in order to receive the Ten Commandments and he did so twice because he broke the first set of the tablets of stone after returning from the mountain for the first time.