Luke 24:51

And it came to pass, while he blessed them, he was parted from them, and carried up into heaven. Luke 24:51.

(51) The words “and was carried up into heaven” are wanting in some of the best MSS., and are omitted accordingly by some recent editors. (http://biblehub.com/commentaries/ellicott/luke/24.htm).

And was carried up into heaven.  Some texts omit. (http://biblehub.com/commentaries/vws/luke/24.htm)

Verse 51. - And it came to pass, while he blessed them, he was parted from them, and carried up into heaven; more accurately rendered, while he blessed them, he parted from them, and was carried up into heaven. The last clause, "was carried up into heaven," is absent from some, but not from the majority of the older authorities. (http://biblehub.com/commentaries/pulpit/luke/24.htm)

Luke 24:50 f. Jesus takes the disciples to Bethany, and while giving them a benediction is parted from them. The words "and was carried up into heaven" are omitted in some of the best MSS., and have probably crept in from Acts 1:9 f. Note that in Lk. everything, including this final departure, seems to have happened on the same day as the Resurrection—contrast the forty days of Acts 1:3. The harmonists insert the Galilean appearances recorded in Matthew 28 and John 21 between Luke 24:43 and Luke 24:44. (https://www.studylight.org/commentaries/pfc/luke-24.html)