25 This describes the nation of Israel approaching God on Mt. Sinai (Exod 19). There is a clear contrast with the reference to Mount Zion in v. 22, so this could be translated “a mountain that can be touched.” But the word “mountain” does not occur here and the more vague description seems to be deliberate.

In other versions

For you have not come to what may be touched, a blazing fire and darkness and gloom and a tempest

You have not come to a mountain that can be touched and that is burning with fire; to darkness, gloom and storm;

For you have not come to what could be touched, to a blazing fire, to darkness, gloom, and storm,

You have not come to a physical mountain, to a place of flaming fire, darkness, gloom, and whirlwind, as the Israelites did at Mount Sinai.

For you have not come to something that can be touched, and to a burning fire, and to darkness, and to gloom, and to a whirlwind,

For ye are not come unto the mount that might be touched, and that burned with fire, nor unto blackness, and darkness, and tempest,

Public Domain