The indeclinable numeral τριάκοντα (triakonta) means 'thirty' and appears in theologically significant contexts. In the parable of the sower, some seed yields thirtyfold (Matt 13:8, 23; Mark 4:8, 20). Judas betrays Jesus for thirty pieces of silver (Matt 26:15), which he returns in remorse (Matt 27:3) and the priests use to buy the potter's field (Matt 27:9), echoing Zechariah 11:12-13. Jesus was 'about thirty years old' when he began his ministry (Luke 3:23). The Bethesda invalid had been ill thirty-eight years (John 5:5). Paul reckons 430 years from promise to law (Gal 3:17). Spanish 'treinta' and Arabic 'thalathin' map directly.