Hebrews 12:18

For ye are not come unto a mount that might be touched, and that burned with fire, and unto blackness, and darkness, and tempest.

Bruce thinks that a reference to "conversion" is in the words "For ye are not come" and as used in Hebrews 12:22, "Ye are come."[15] The mountain that might be touched, of course, was Sinai; and the blackness, darkness, and tempest refer to the dramatic outflashings of God's power in the violent demonstrations of nature accompanying that event (Exodus 19:18).