Here in the 1892 RLDS edition, the subject pronoun he was accidentally omitted. In fact, this edition maintained the semicolon preceding the clause; that is, the 1892 text reads “of my Spirit; and shall know and bear record.” The pronoun was restored in the next RLDS edition (in 1908). The critical text will maintain the original he here. Without the he, the last predicate incorrectly reads as if the Lord himself “shall know and bear record”.
Summary: Maintain the subject pronoun he in the last clause of this passage (“and he shall know and bear record”).