Genesis 38:30 YLT

²⁸  and it cometh to pass in her bearing, that 'one' giveth out a hand, and the midwife taketh and bindeth on his hand a scarlet thread, saying, 'This hath come out first.'

²⁹  And it cometh to pass as he draweth back his hand, that lo, his brother hath come out, and she saith, 'What! thou hast broken forth -- on thee 'is' the breach;' and he calleth his name Pharez;

³⁰  and afterwards hath his brother come out, on whose hand 'is' the scarlet thread, and he calleth his name Zarah.