KJV: For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
NASB: "For false Christs and false prophets will arise and will show great signs and wonders, so as to mislead, if possible, even the elect.
KJV: And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
NASB: "And then the sign of the Son of Man will appear in the sky, and then all the tribes of the earth will mourn, and they will see the SON OF MAN COMING ON THE CLOUDS OF THE SKY with power and great glory.
KJV: And he sighed deeply in his spirit, and saith, Why doth this generation seek after a sign? verily I say unto you, There shall no sign be given unto this generation.
NASB: Sighing deeply in His spirit, He said, "Why does this generation seek for a sign? Truly I say to you, no sign will be given to this generation."
KJV: And they went forth, and preached every where, the Lord working with them, and confirming the word with signs following. Amen.
NASB: And they went out and preached everywhere, while the Lord worked with them, and confirmed the word by the signs that followed. And they promptly reported all these instructions to Peter and his companions. And after that, Jesus Himself sent out through them from east to west the sacred and imperishable proclamation of eternal salvation.