Rig 1.191.02

samāno mantraḥ samitiḥ samānī samānaṁ manaḥ saha cittameṣām। samānaṁ mantramabhi mantraye vaḥ samānena vo haviṣā juhomi॥

Common be the prayer of these (assembled worshippers), common be the acquisition, common the purpose, associated be the desire. I repeat for you a common prayer, I offer for you with a common oblation.