'Mouth of the Lord' in the Bible

Notwithstanding, ye would not consent to go up, but were disobedient unto the mouth of the LORD your God,

And when I told you, ye would not hear: but disobeyed the mouth of the LORD, and went presumptuously up into the hills.

And he humbled thee, and suffered thee to hunger, and fed thee with manna, which thou knewest not, neither did thy fathers know; that he might make thee know that man doth not live by bread only, but by every word that proceedeth out of the mouth of the LORD doth man live.

Yea, and when the LORD sent you from Kadesh Barnea, saying, 'Go up and conquer the land which I have given you,' ye disobeyed the mouth of the LORD your God, and neither believed him nor hearkened unto his voice.