There is a prophecy in Deuteronomy 18:18 that the Lord would send another prophet like unto Moses, and to him shall ye listen. The book of Deuteronomy had been rediscovered and had become very influential when Lehi was a young man, probably still in his twenties. Lehi’s own visions and prophecies about the coming of a divine figure even greater than Moses was corroborated by, and perhaps influenced by, this earlier writing in Deuteronomy. Lehi explained that a great number of prophets had testified that the Lord had promised to send a Messiah, and as they and Lehi had testified, that Messiah would be the Savior whom Lehi had seen in vision.
For insights regarding Lehi speaking of Jesus being baptized at Bethabara (1 Nephi 10:9–10), see:
Book of Mormon Central, "Video: The special symbolism behind the place where Jesus Christ was baptized," online at bookofmormoncentral.org.
On Nephi’s desire to see, hear, and know the meaning of his father’s visions (1 Nephi 10:17), watch for the upcoming discussion of the interpretive relationship between 1 Nephi 11–14 and 1 Nephi 8. In this regard, see:
Jared M. Halverson, "Lehi’s Dream and Nephi’s Vision as Apocalyptic Literature," in The Things Which My Father Saw: Approaches to Lehi’s Dream and Nephi’s Vision (2011 Sperry Symposium), ed. Daniel L. Belnap, Gaye Strathearn, and Stanley A. Johnson (Salt Lake City and Provo, UT: Deseret Book and Religious Studies Center, Brigham Young University, 2011), 53–69.
"A tree and a river, a building and a rod, mists of darkness and wandering multitudes—each element leaves inquisitive readers with a desire that echoes Nephi’s—to ‘know the interpretation thereof’ (1 Nephi 11:11)."