Oliver Cowdery initially omitted the verb form made when he copied from 𝓞 into 𝓟, but virtually immediately he added it supralinearly (with no increase in the level of ink flow). Undoubtedly, 𝓞 read “it shall be made known” since “it shall be known” is theoretically possible. In other words, there would have been no strong motivation for Oliver to emend the text here. Elsewhere the text has ten instances of “shall be made known”, but there is also one of “shall be known”:
Here in Alma 13:26, the critical text will follow the corrected reading, “it shall be made known unto just and holy men”.
Summary: Accept in Alma 13:26 Oliver Cowdery’s virtually immediate correction in 𝓟 to “it shall be made known unto just and holy men”.