Bede the Venerable

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Now the Passover, which is called in Hebrew “Phase,” is not so named from the Passion, but from the passing over, because the destroying angel, seeing the blood on the doors of the Israelites, passed over them, and touched not their first-born. Or the Lord Himself, giving assistance to His people, walked over them. But herein is the difference between the Passover and the feast of unleavened bread, that by the Passover is meant that day alone on which the lamb was slain towards the evening, that is, on the fourteenth day of the first month, but on the fifteenth, when the Israelites went out of Egypt, followed the feast of unleavened bread for seven days, up to the twenty-first of the same month. Hence the writers of the Gospel substitute one indifferently for the other. As here it is said, The day of unleavened bread, which is called the Passover. But it is signified by a mystery, that Christ having suffered once for us, has commanded us through the whole time of this world which is passed in seven days, to live in the unleavened bread of sincerity and truth.