Numbers 12:1-5 NIV
(1) Miriam and Aaron began to talk against Moses because of his Cushite wife, for he had married a Cushite. (2) “Has the Lord spoken only through Moses?” they asked. “Hasn’t he also spoken through us?” And the Lord heard this.
(3) (Now Moses was a very humble man, more humble than anyone else on the face of the earth.)
(4) At once the Lord said to Moses, Aaron and Miriam, “Come out to the tent of meeting, all three of you.” So the three of them went out. (5) Then the Lord came down in a pillar of cloud; he stood at the entrance to the tent and summoned Aaron and Miriam. When the two of them stepped forward,
This verse seems out of place to me. If we exclude it, we are missing nothing and we smoothly go to what happened next. Also the verse contradicts itself - (Bible suggests Moses wrote Pentateuch) - as if he was so humble, then why would he boast himself, especially because of his humblesness?
So, do we have any evidence in the ancient writings of all kind, manuscripts etc. that Numbers 12:3 is a later addition?
EDIT: I am getting opinions only, the purpose of this site is to show evidence, and the only one posted here is a mention of no manuscript variations.