John Gill Commentary Judges 4:12

"And they told Sisera that Barak the son of Abinoam was gone up to mount Tabor." — Judges 4:12 (ASV)

And they showed Sisera Either some of the Canaanites that dwelt near Tabor, or some spies that Sisera had out; though some think the Kenites told him, who were at peace with Jabin, (Judges 4:17) ; yet whether out of good will or ill will cannot be said: however, so it was ordered by the providence of God, that by some means or another Sisera should be informed

that Barak the son of Abinoam was gone up to Mount Tabor ; and no doubt at the same time he was told the number of men that went with him; from which he might well conclude, that such a warlike man, with such a force collected together, and having posted himself in an high and strong mountain, must have some design to cause a revolt of Israel from Jabin his prince.