Reference for Yoma 78:5
ת"ר ארבעים שנה קודם חורבן הבית לא היה גורל עולה בימין ולא היה לשון של זהורית מלבין ולא היה נר מערבי דולק
His brethren [that year] the priests forbore to mention the Ineffable Name in pronouncing the [priestly] blessing.<span class="x" onmousemove="('comment',' Men. 109b. Tosaf Sotah ');"><sup>4</sup></span> Our Rabbis taught: During the last forty years before the destruction of the Temple the lot ['For the Lord'] did not come up in the right hand; nor did the crimson-coloured strap become white; nor did the westernmost light shine; and the doors of the Hekal would open by themselves, until R'Johanan B'Zakkai rebuked them, saying: Hekal, Hekal, why wilt thou be the alarmer thyself?<span class="x" onmousemove="('comment',' Predict thy own destruction.');"><sup>5</sup></span>