קבלה אויף תהילים 134:1

R. Judah discoursed on the verse: Behold, bless ye the Lord, all ye servants of the Lord, etc. (Ps. 134, 1). ‘This verse tells us’, he said, ‘that only those are truly worthy to bless the Almighty who are the servants of the Lord. For although it is true that every Israelite is regarded as fitted to bless the Almighty, yet only the servants of the Lord are worthy to offer those benedictions from which is diffused blessing in the upper and lower worlds. And who, then, are those servants of the Lord? “They that stand in the house of the Lord in the night seasons” (Ibid.), to wit, those who rise at midnight and keep vigil in the study of the Torah: these do “stand in the house of the Lord in the night seasons”, as at that time the Holy One, blessed be He, comes to disport Himself with the righteous in the Garden of Eden. Since, then, we are passing the night in expounding the Torah, let us say something about Isaac, whom we have just mentioned.’