Strong G1567 ἐκζητέω ekzēteō · to seek out

Luke

1. Luke 11:50
   That the blood of all the prophets, which was shed from the foundation of the world, may be required of this generation;
2. Luke 11:51
   From the blood of Abel unto the blood of Zacharias, which perished between the altar and the temple: verily I say unto you, It shall be required of this generation.