Reference for Yoma 151:10
הא לא דמיא התם בארבעין יומין הכא חדא שעתא התם לכ"ע הכא לישראל לחודיה ונפיש להו טפי ר' אלעזר המודעי פתיחה פתיחה גמר
Now how many windows has a door? Four; hence 'doors' [imply] eight.<span class="x" onmousemove="('comment',' At least two are implied in 'doors' hence at least eight windows. But the measure of goodness surpasses the measure of punishment (as e.g., Ex. II, 6, 7) . There were at least two 'windows' of heaven at the flood, as implied in 'windows' which poured forth fifteen cubits of rain; the eight windows (of the two doors of heaven) must have produced at least no less, i.e., sixty cubits of manna, since the measure of goodness is surely no smaller than that of punishment. So that 'sixty' here is to be taken as minimum.');"><sup>15</sup></span> Thus it is found that the manna which fell upon Israel was sixty cubits.