Matthew 18:6

18:6 “But if anyone causes one of these little ones who believe in me to sin,5 it would be better for him to have a huge millstone6 hung around his neck and to be drowned in the open sea.7

5	tn The Greek term σκανδαλίζω (skandalizō), translated here “causes to sin” can also be translated “offends” or “causes to stumble.”
6	tn Grk “the millstone of a donkey.” This refers to a large flat stone turned by a donkey in the process of grinding grain (BDAG 661 s.v. μύλος 2; L&N 7.68–69). The same term is used in the parallel account in Mark 9:42. sn The punishment of drowning with a heavy weight attached is extremely gruesome and reflects Jesus’ views concerning those who cause others who believe in him to sin.
7	tn The term translated “open” here (πελάγει, pelagei) refers to the open sea as opposed to a stretch of water near a coastline (BDAG 794 s.v. πέλαγος). A similar English expression would be “the high seas.”