Numbers 2:16

And all that were numbered in the camp of Reuben [were] an
hundred thousand and fifty and one thousand and four hundred and fifty,
throughout their armies
151,450 men. Putting Reuben's host, and the hosts of Simeon and Gad together, ( Numbers 2:13 Numbers 2:15 ) , which was much lesser than the preceding camp, being 34,500 fewer in number:

and they shall set forth in the second rank:
they in journeying moving next to the camp of Judah, and before the tabernacle; for though, while encamped, the camp of Reuben lay on the south, or right side of it, yet, when marching, went before it.