Albert Barnes Commentary Exodus 12:11

"And thus shall ye eat it: with your loins girded, your shoes on your feet, and your staff in your hand; and ye shall eat it in haste: it is Jehovah`s passover." — Exodus 12:11 (ASV)

These instructions are understood by the Jews to apply only to the first Passover, when they belonged to the occasion. There is no trace of their observance at any later time. Each of the directions marks preparation for a journey: the long flowing robes are girded round the loins; shoes or sandals, not worn in the house or at meals, were fastened on the feet; and the traveler’s staff was taken in hand.

The Lord’s Passover—This is the great and most significant name for the whole ordinance. The word Passover conveys as closely as possible the true meaning of the original, whose primary meaning is generally understood to be “pass rapidly,” like a bird with outstretched wings, but it undoubtedly includes the idea of sparing (Exodus 12:13). See Isaiah 31:5, which combines the two great ideas involved in the word.