Judges 18:20

“And the priest’s heart was glad, etc.] He rejoiced that such an opportunity offered; it suited well with his covetous, ambitious, rambling, and unsettled disposition of mind: and he took the ephod, and the teraphim, and the graven image; and no doubt the molten image also, out of the hands of the five men into his own, agreeing to go with them, and officiate for them: and went in the midst of the people; the six hundred armed men, either for the security of himself, if Micah should raise his servants, and his neighbours, to pursue after him, and fetch him back, with his images; or, as others think, in imitation of the priests bearing the ark, who in journeying marched in the middle of the…”

“Was glad - Being wholly governed by his own interest. The midst - Both for the greater security of such precious things, and that Micah might not be able to come at him, to injure or upbraid him; and, it may be, because that was the place where the ark used to be carried. Judges 18:21”

“heart: Jdg 17:10; Pro 30:15; Isa 56:11; Eze 13:19; Hos 4:3; Act 20:33; Phi 3:19; Pe2 2:3, Pe2 2:15, Pe2 2:16 went: He was glad of his preferment among the Danites; and went into the crowd, that he might not be discovered by Micah or his family. Judges 18:21”

“Then was the priest's heart glad (merry; cf. Jdg 19:6, Jdg 19:9; Rut 3:7), and he took the ephod, etc., and came amongst the people (the Danites). The first clause of this verse is attached to the supplementary statement in Jdg 18:18, Jdg 18:19, for the purpose of linking on the further progress of the affair, which is given in the second clause; for, according to Jdg 18:17, the priest could only receive the ephod, etc., into his charge from the hands of the Danites, since they had taken them out of Micah's God's house. Judges 18:21”