'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.

He humbled thee and made thee hunger and fed thee with Manna, which neither thou nor thy father knew of, to make thee know that a man must not live by bread only: but by all that proceedeth out of the mouth of the LORD must a 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.