Here the 1852 LDS edition changed his to the, apparently unintentionally. The 1920 LDS edition restored the original his. For another example where his people was replaced by the people (but in the 1840 edition), see under Alma 51:29. Here in 3 Nephi 4:23, the critical text will maintain his people, the reading of 𝓟 and the 1830 edition.
Summary: Maintain the determiner his in 3 Nephi 4:23: “Zemnarihah did give command unto his people”.