en_tn_lite_do_not_use/mat/12/30.md

who is not with me

"who does not support me" or "who does not work with me"

is against me

"opposes me" or "works against me"

the one who does not gather with me scatters

Jesus is using a metaphor that refers to a person either gathering the flock of sheep to a shepherd or making them scatter away from the shepherd. Jesus means that a person is either helping to make people become disciples of Jesus or he is making people reject Jesus. (See: rc://en/ta/man/jit/figs-metaphor)