Bible Verses about “staying in the church”

“Jesus answered them, ‹Have not I chosen you twelve, and one of you is a devil?›”

“He spake of Judas Iscariot [the son] of Simon: for he it was that should betray him, being one of the twelve.”

“Then said Jesus unto the twelve, ‹Will ye also go away?›”

“Then Simon Peter answered him, Lord, to whom shall we go? thou hast the words of eternal life.”

“And we believe and are sure that thou art that Christ, the Son of the living God.”