Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
LXX

1 Kings 7:43

And [he made] the porch of the pillars, [they were] fifty [cubits] long and fifty broad, the porch joining them in front; and the [other] pillars and the thick beam [were] in front of the house by the porches.

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