1 John 2:19

AKJV_Strongs(i)
  19 G1831 They went G1487 out from us, but they were not of us; for if G2258 they had been G639 of us, they would no doubt G3306 have continued G5319 with us: but they went out, that they might be made G5319 manifest G3956 that they were not all of us.