The longest day that God appoints — Passover

The longest day that God appoints 1
Will finish with the sun.
Anguish can travel to its stake,
And then it must return.
(F.1153/J.1769)
[1] day, God appoints:: Passover is appointed by God, summer solstice by men. longest:: the fear that makes a day long.
[2] finish, sun:: that night God "will smite all the firstborn in the land of Egypt."
[3, 4] stake, return:: God will passover "the two side posts" marked with blood.
[3] Anguish:: God's anger against the Egypt.
[4] it:: the anguish.