I'm not sure if this is the right place, but I've found an error in the links in this paragraph: The popular early sage Ben Sira warned that if one takes vengeance, God will take vengeance for one’s sins (Sir 28:1), if one forgives others one will be forgiven by God (28:2), if one hates others one does not merit God’s pardon (28:3). Craig S. Keener, The Gospel of Matthew: A Socio-Rhetorical Commentary, (Grand Rapids, MI; Cambridge, U.K.: Wm. B. Eerdmans Publishing Co., 2009), 240. The links for Sir 28:2, 3 point to Matthew rather than Sirach.