'It is the Lord' in the Bible

Now you are to eat it in this manner: [be prepared for a journey] with your loins girded [that is, with the outer garment tucked into the band], your sandals on your feet, and your staff in your hand; you shall eat it quickly—it is the Lord’s Passover.

And Moses and Aaron said to all the children of Israel, This evening it will be clear to you that it is the Lord who has taken you out of the land of Egypt:

And Moses said, "That, eat this day: for today it is the LORD's Sabbath; today ye shall find none in the field.