Regarding oaths, Jesus doesn’t quote any specific passage but summarizes the concept of taking an oath, specifically invoking God’s name (Exod. 20:7; Lev. 19:12; Num. 30:3–15; Lev. 24:19–20). Dire consequences could result from invoking God’s name in an oath. They were required occasionally, however (Exod. 22:10–13; Num. 5:16–22). By the time of Jesus, Jews avoided using God’s name lest it be in vain, so they would swear by sacred things (cf. Philo, Special Laws 2.1.5; Nedarim 1.3–4). Jews believed one was obligated if he swore by the temple’s gold or the altar’s offering but not by the temple or altar themselves (Matt. 23:16–22). You weren’t required to keep an oath if you swore by heaven or earth, but if you used any variation of God’s name, you were required to fulfill your oath (Shebuoth 4.13). Because they used loopholes in fulfilling their vows, they were hypocrites and deceitful, profaning God’s name. Just answer truthfully (cf. 2 Cor. 1:17–24; James 5:12). Jesus’ attitude was shared by the Essenes.
They are eminent for fidelity, and are ministers of peace; whatsoever they say also is firmer than an oath; but swearing is avoided by them, and they esteem it worse than perjury; for they say, that he who cannot be believed without [swearing by] God, is already condemned. (Josephus, Wars 2.8.6)
This isn’t a prohibition against oaths per se because Jesus answered the High Priest while under oath (Matt. 26:63–64).
The eye for an eye concept appears in three places and spells out different ways compensation may be made for damage to a person’s body (Exod. 21:23–25; Lev. 24:19–20; Deut. 19:21). This concept wasn’t unique to Judaism. Similar ideas appear in Roman Law and the Babylonian Code of Hammurabi, but the Torah concept treated everyone equally and not according to social class. It was meant to limit vengeance. We don’t see a trace of this being carried out because, more often than not, financial compensation was provided for the injury. Jesus gives us the commands not as to how to respond to physical harm but to public humiliation. His examples are the slap (cf. 2 Cor. 11:20), lawsuit, and conscription. Not escalating matters is to shame the attacker and maintain one’s honor. Usually, the response to a slap would be to either cower or hit back. Hitting back escalates, and cowering relinquishes a person’s dignity. Standing firmly, offering the other cheek, is a way to control the situation. With the lawsuit, a person can avoid the court, which would result in arrest, or they could accept the verdict, which might entail suffering (cf. Exod. 22:26–27). The injustice of the whole situation is revealed by giving the tunic with the cloak. Roman law compelled a person to obey for a mile (cf. Matt. 27:32). To refuse meant a beating. To comply is humiliation, so going beyond what was compelled by law is intended to humiliate the one who has conscripted a person.
The first part of verse 43 derives from Leviticus 19:18. The Torah doesn’t say to hate your enemies, but in the Dead Sea Scrolls, we read, “He is to teach them to love everything [or everyone]. He chose and to hate everything [or everyone] he rejected” (1QS 1:3–4). There are other Old Testament passages mitigating how one feels about their enemies. When an enemy falls, we’re not to gloat (Prov. 24:17); otherwise, God will be displeased (Prov. 24:18; cf. 25:21–22). When Judah was exiled, they were supposed to pray for their city (Jer. 29:7). Paul iterates doing good to enemies is bound to frustrate them (Rom. 12:20). Praying for them not only is for their benefit but ours as well. It orients our minds towards them how it should be rather than allowing bitterness to take root. To be like our heavenly father is to love those who are unlovable. It’s to go above and beyond what is customarily anticipated or endorsed. To fall short of this is to carry the same deformity as our enemies.
A Minister's Study 