Brigham teaches eternal life is knowing Adam and who he is.

Date: Oct 15, 1870
Type: Personal Journal / Diary
Source: Brigham Young
LDS
Hearsay: Scribed Paraphrase
Reference: Joseph F. Smith, Journal, October 15, 1870, Joseph F. Smith papers, 1854-1918, MS 1325, Church History Library
Scribe/Publisher: Joseph F. Smith
People: Brigham Young, Wilford Woodruff, Joseph F. Smith, Adam
Audience: N/A
Transcription: p.m. at School, opeing prayer by bro. W. Woodruff, who spoke a short time on the subject of Adam being Michael, the arch Angel &c refered to D&C p. 79 & Dan. 7. ch. See also D&C p. 106 (115. sec. 10) Sec. 50 p. 200
Bro. Cannon made a few remarks on the same subject. bro. Henry said he felt like shouting "glory hallilujah". . . . Prest. Young spoke on the subject of Adam and God. "Whom to know is life eternal." Who knows him? it is certainly important to know him. he wanted the brethren to meditate on the subject, pray about it and keep it to themselves.
Source Link: https://catalog.churchofjesuschrist.org/assets/acec10c2-8a6d-4317-82a6-dd76bc965ba8/0/37
Citations in Mormonr Qnas: Adam-God Theory