Here in the original manuscript, Oliver Cowdery initially omitted the relative clause “that is pure”. Virtually immediately he inserted this clause (there is no change in the level of ink flow for the supralinear insertion). Parallelism with the preceding clauses supports the corrected reading in 𝓞:
Summary: Accept in Alma 32:42 the corrected reading in 𝓞, “yea and pure above all that is pure”; there is no change in the level of ink flow for this correction, and this relative clause is supported by parallelism in the immediately preceding text.