Haggai said that Yahweh was with them (Hag 1:13-1:13)

“Then Haggai,

The messenger of Yahweh,

Spoke to the people

With Yahweh’s message,

Saying.

‘I am with you,

Says Yahweh.’”

The prophet Haggai, who was a messenger from Yahweh, spoke to the assembled people of Jerusalem to reassure them that Yahweh was with them.  This reassurance or presence of Yahweh was his main message.