'Assuming' in the Bible

Assuming He was in the traveling party, they went a day’s journey. Then they began looking for Him among their relatives and friends.

assuming you heard about Him and were taught by Him, because the truth is in Jesus.

Instead He emptied Himselfby assuming the form of a slave,taking on the likeness of men.And when He had come as a manin His external form,

assuming that I will somehow reach the resurrection from among the dead.