Pseudo-Chrysostom
Catena Aurea · Matthäusevangelium 5
Blessed are ye, when men shall revile you, and persecute you, and shall say all manner of evil against you falsely, for My sake. Rejoice, and be exceeding glad: for great is your reward in heaven: for so persecuted they the prophets which were before you.
But if it be true that he who offers a cup of water does not lose his reward, consequently he who has been wronged but by a single word of calumny, shall not be without a reward. But that the reviled may have a claim to this blessing, two things are necessary, it must be false, and it must be for God’s sake; otherwise he has not the reward of this blessing; therefore He adds, falsely for my sake.