Now when Jesus was risen early the first day of the week, he appeared first to Mary Magdalene, out of whom he had cast seven devils. 10And she went and told them that had been with him, as they mourned and wept. 11And they, when they had heard that he was alive, and had been seen of her, believed not. 12After that he appeared in another form unto two of them, as they walked, and went into the country. 13And they went and told it unto the residue: neither believed they them. 14Afterward he appeared unto the eleven as they sat at meat, and upbraided them with their unbelief and hardness of heart, because they believed not them which had seen him after he was risen. 15And he said unto them, Go ye into all the world, and preach the gospel to every creature. 16He that believeth and is baptized shall be saved; but he that believeth not shall be damned. 17And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues; 18They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover. 19So then after the Lord had spoken unto them, he was received up into heaven, and sat on the right hand of God. 20And they went forth, and preached every where, the Lord working with them, and confirming the word with signs following. Amen.
Mark 16:9-20
The longer ending of Mark 16 was not added later.
The longer ending is supported by W (4th/5th century), A (5th century), C (5th century), D (5th century), Theta (9th century), 33 (9th century), 2427 (14th century?), majority of all Greek manuscripts, Vulgate and part of the Old Latin tradition, Syrus Curetonianus, Syriac Peshitta, Syrus Harklensis, Bohairic (Nestle-Aland: Novum Testamentum Graece, 27th revised edition (2006)). The late 2nd century Irenaeus considered the passage as authentic scripture, citing Mark 16:19 as follows:
“Also, towards the conclusion of his Gospel, Mark says: So then, after the Lord Jesus had spoken to them, He was received up into heaven, and sits on the right hand of God; confirming what had been spoken by the prophet: The Lord said to my Lord, Sit on My right hand, until I make Your foes Your footstool.”
Case for the Longer Ending of Mark The longer ending of Mark, which appears as Mark 16:9-20 in most translations, is believed to be spurious by many Bible translators and commentators today. Most modern translations footnote the passage, and the NIV 2011 prints the passage in italics, further
Should the Longer Ending of Mark (Mark 16:9-20) be in the Bible?
This comes down to whether you believe God preserved his word, or what we have is just man’s best attempts to recreate some long-lost originals that no one has or will ever see. Those who believe the Bible when it says God will preserve his word will always have a KJV in hand.