Hisgalus 1:11

Saying, Ani Hu the Aleph and the Tav, HaRishon (The first) and HaAcharon (The last): and, What you see [in the chazon], write in a sefer and send it to the sheva (seven) HaKehillot, to Ephesus and to Smyrna and to Pergamum and to Thyatira and to Sardis and to Philadelphia and to Laodicea.