New Defender's Study Bible Notes
18:1 the LORD appeared. This remarkable theophany is highly instructive. The Lord Jesus in pre-incarnate form and two of His angels all appeared in the form of three men, even eating with Abraham. The writer of Hebrews refers to this event when he says that “some have entertained angels unawares” (Hebrews 13:2). Later the two angels move on to communicate with Lot in Sodom (Genesis 18:22) while the Lord remained to talk further with Abraham. Thus both the angels and God Himself can, when necessary, assume fully human bodies. Similarly, in His resurrection body, Christ “did eat before them” (Luke 24:43) and He said that, in the resurrection, all believers will be “as the angels of God in heaven” (Matthew 22:30). Our immortal bodies will be fully physical bodies, but, like the angels, not subject to the gravitational and electro-magnetic forces which govern our present bodies.
18:8 did eat. It is significant that not only Abraham, but also the three visitors–two of whom were angels, the other being Christ Himself in a theophany–all ate the meat prepared by Sarah and the servant. Whatever nutritional merits vegetarian diets might or might not have, they are not required by Biblical commandment. Note Genesis 9:3,4; I Timothy 4:3-4.
18:14 hard. “Hard” is the same word as “wonderful,” one of the terms used to describe the coming Messiah in Isaiah 9:6. God gave Sarah the faith to believe He could accomplish this wonderful miracle of rejuvenating her body, partly by letting her know He could hear her laugh even when she was out of His sight, and only laughed “within herself” (Genesis 18:12).