Bede : And Jonathan said to him: Tomorrow is the New Moon, etc. The holy Scripture does not denote those unequal beginnings of the months, which the Romans have annually, twelve in number, but the new moons, which are called Neomenia by the Greeks; which the Hebrews solemnly celebrated according to the institution of the law, with sacrifices, feasts, and the rest of the Sabbath, that is, of rest. This is signified by the Holy Spirit, as often as Christ sprinkles the Church, as often as any faithful soul, like the sun, with the new light of his grace, immediately spiritual sacrifices of life are to be offered more solemnly to God, immediately sweetly indulging in the feasts of divine sayings, immediately all the commotions of external cares must be put aside in happy rest. Wherefore Jonathan now speaks to David about coming tomorrow on the Calends. — Commentary on Samuel