Yahweh is trustworthy (Ps 115:9-115:11)

“O Israel!

Trust in Yahweh!

He is their help.

He is their shield.

O house of Aaron!

Trust in Yahweh!

He is their help

He is their shield.

You who fear Yahweh!

Trust in Yahweh!

He is their help.

He is their shield.”

This choral hymn asks Israel to trust Yahweh. It also asks the house of Aaron, which are the priests, to trust Yahweh. They always seem to be separate in some sense from the rest of the Israelites. In the end they ask all who fear Yahweh to trust him. He was going to help them. He was going to be their shield against evil doers. Thus this two line refrain is repeated 3 times.