מדרש על מלכים א 6:2

There was one more who used to say: "When our love was strong, we found room to sleep on the broad side of a sword; now when our love is gone a bed of sixty [yards] is not sufficient for us." R. Huna said: We find this in the Scriptures. At first [when Israel was good] it is written (Ex. 25, 22) I will speak with thee from above the cover. And we are taught in a Baraitha that the ark measured nine spans, and the cover one; hence, altogether, it measured ten, and it is written (I Kings 6, 2) And the house which was built by Solomon unto the Lord was sixty cubits in length. And finally there is a passage (Is. 66, 1) Thus hath said the Lord, the heavens are My throne, and the earth is My foot-stool; where is there a house that ye can build unto Me?"