John Gill Commentary Psalms 104:20

"Thou makest darkness, and it is night, Wherein all the beasts of the forest creep forth." — Psalms 104:20 (ASV)

Thou makest darkness, and it is night
The darkness was before the light, and the night before the day, (Genesis 1:2Genesis 1:4Genesis 1:5) and now the darkness and night are made by the setting of the sun before mentioned; see (Isaiah 45:7) .

Wherein all the beasts of the field do creep forth ;
out of their dens, and range about for their prey, as the evening wolves and others: and these are not the only creatures that choose the night and darkness; all wicked men do the same; whose deeds are evil, and do not care to come to the light, lest they should be reproved; particularly drunkards, adulterers, thieves, and murderers, (John 3:20John 3:21) (1 Thessalonians 5:7) (Job 24:13–17) . So the Scribes and Pharisees, when they consulted to take away the life of Christ, and agreed with Judas to betray him, did it in the night: so false teachers, who are wolves in sheep's clothing, when it is a night of darkness with the church, take the advantage of it, to creep about and spread their pernicious doctrines; see (2 Timothy 3:6) (Jude 1:4) .