Pseudo-Chrysostom
Catena Aurea · Matthäusevangelium 5
Think not that I am come to destroy the Law, or the Prophets: I am not come to destroy, but to fulfil. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
Otherwise; the precepts of Moses are easy to obey; Thou shall not kill. Thou shall not commit adultery. The very greatness of the crime is a check upon the desire of committing it; therefore the reward of observance is small, the sin of transgression great. But Christ’s precepts, Thou shalt not be angry, Thou shalt not lust, are hard to obey, and therefore in their reward they are great, in their transgression, ‘least.’ It is thus He speaks of these precepts of Christ, such as Thou shall not be angry, Thou shalt not lust, as ‘the least;’ and they who commit these lesser sins, are the least in the kingdom of God; that is, he who has been angry and not sinned grievously is secure from the punishment of eternal damnation; yet he does not attain that glory which they attain who fulfil even these least.