A.T. Robertson Commentary Matthew 7:25

"and the rain descended, and the floods came, and the winds blew, and beat upon that house; and if fell not: for it was founded upon the rock." — Matthew 7:25 (ASV)

Was founded (τεθεμελιωτο). Past perfect indicative passive state of completion in the past. It had been built upon the rock and it stood. No augment.