When studying certain subjects in the bible, you should look up the first time it’s mentioned. The first time that fasting is mentioned is in Judges 20:26. The word fast there is, tsûwm (tsoom); a primitive root; to cover over (the mouth) that (is) to fast. I’ve looked up every word having to do with…
worshiping the Father in spirit and in truth
John 4:23, 24 