A.T. Robertson Commentary Matthew 7:3

"And why beholdest thou the mote that is in thy brother`s eye, but considerest not the beam that is in thine own eye?" — Matthew 7:3 (ASV)

The mote (το καρφος). Not dust, but a piece of dried wood or chaff, splinter (Weymouth, Moffatt), speck (Goodspeed), a very small particle that may irritate.

The beam (την δοκον). A log on which planks in the house rest (so papyri), joist, rafter, plank (Moffatt), pole sticking out grotesquely. Probably a current proverb quoted by Jesus like our people in glass houses throwing stones. Tholuck quotes an Arabic proverb: "How seest thou the splinter in thy brother's eye, and seest not the cross-beam in thine eye?"