Mishnah Yoma 4:2, 6:8 describe the Yom Kippur scarlet-cord ritual (Lev 16 + Isaiah 1:18); Alfred Edersheim's The Temple (1874, PD) reconstructs the first-century practice from these same tractates. Babylonian Talmud Yoma 39b records that for forty years before the Temple's destruction (AD 70), the cord ceased to turn white and the priest's lot "for Jehovah" stopped coming up in the right hand, i.e., from c. AD 30 onward, the traditional date of the crucifixion.
The Jewish scribes had every interpretive reason not to preserve this detail; they preserved it anyway. What the Talmud itself claims, and no more: the phenomenon and its forty-year span. The AD-30 alignment with the crucifixion is the church's own overlay on a Jewish source, not a connection the Talmud draws, held here as interpretation, not as the rabbis' verdict. (No verbatim excerpt of Yoma 39b is rendered on this page pending confirmed license for a public-domain edition; Rodkinson's 1903 translation is the candidate PD text.)