Or, “Two men in one field” shall be found performing the same labour, sowing corn together, but not reaping the same fruit of their labour. The two “grinding together” we may understand either of the Synagogue and the Church, which seem to grind together in the Law, and to make of the same Scriptures meal of the commandments of God; or of other heresies, which out of both or one Testament, seem to grind meal of their own doctrines.
Hilary:; The “two in one bed” are those who preach alike the Lord’s rest after His passion, about which heretics and catholics have the same confession; but because the Catholic Faith preaches the unity of the Godhead of the Father and the Son, and the false creed of the heretics impugns that, therefore shall the Divine judgment decide between the confession of these two by taking one and leaving the other.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).