Bede

But also Israel encamped by the fountain, etc. The fountain which was in Jezreel, that is, in the seed of God, indicates the baptismal washing, by which the children of the Church are regenerated through the grace of the Holy Spirit. If therefore you understand the unbelieving Jews, or the heretics worse than unbelievers, figured in the name of Israel, both place their treacherous camps over the fountain of renewing grace; one through pride by despising it, the other through heresy by violating it.

Commentary on Samuel ↗