Pascha (Passover) characterizes the life of the disciples of Jesus. St. John Chrysostom:

Let not any one of them that eat this Passover look towards Egypt, but towards Heaven, towards “Jerusalem that is above.” (Gal. 4:26.) On this account thou eatest with thy loins girded, on this account thou eatest with shoes on thy feet, that thou mayest know, that from the moment thou first beginnest to eat the Passover, thou oughtest to set out, and to be upon thy journey. And this implies two things, both that we must depart out of Egypt, and that, whilst we stay, we must stay henceforth as in a strange country; “for our citizenship,” saith he, “is in Heaven” (Phil. 3:20); and that all our life long we should ever be prepared, so that when we are called we may not put it off, but say, “My heart is fixed.” (Ps. 108:1.)

(NPNF 1:13, p165)