Reference for Sanhedrin 75:12
תניא היה רבי מאיר אומר בשלשה דברים אדם משתנה מחבירו בקול במראה ובדעת בקול ובמראה משום ערוה ובדעת מפני הגזלנין והחמסנין
And how many were they? — A thousand. 'Ulla said: He advanced [the exile by] two years as compared with the period indicated by we-noshantem.<span class="x" onmousemove="('comment',' And ye shall have been long (lit., 'grown old'). Deut. IV, 25. The numerical value of [H] (6 + 50 + 6 + 300 + 50 + 400 + 40) is eight hundred and fifty-two. Subtracting two years according to this Haggadah, there are eight hundred and fifty years left, which is the length of time between Israel's entry into Palestine and the destruction of the Temple. The Temple was erected in the four hundred and eightieth year from the Exodus out of Egypt, and it stood for four hundred and ten years. Subtracting forty years for the period of their wanderings in the desert, we reach a total of eight hundred and fifty years that acceleration by two years is here regarded as a 'righteous' (i.e., charitable) act, since it averted the complete destruction threatened in Deut. IV, 26. ');"><sup>21</sup></span>