Unstable as water,.... Which is not to be understood of the levity of his mind, and his disposition to hurt, and the impetuous force of that breaking forth like water, and carrying him into the commission of it; but rather of his fall from his excellency and dignity, like the fall of water from an high place; and of his being vile, mean, and contemptible, useless and unprofitable, like water spilled on the ground; and of his weak and strengthless condition and circumstances, being deprived of the prerogatives and privileges of his birthright, and having lost all his honour and grandeur, power and authority.
The word in the Arabic language signifies to be proud and haughty, to lift up one's self, to swell and rise like the turgent and swelling waters: but though he did thus lift himself, yet it follows,thou shall not excel; not have the excellency of dignity and power which belonged to him as the firstborn; the birthright and the double portion were given to Joseph, who had two tribes descending from him, when Reuben had but one; the kingdom was given to Judah, and the priesthood to Levi, as both the Targums of Jonathan and Jerusalem observe: as he did not excel his brethren in honour and dignity, so neither in wealth and riches, nor in numbers; see De 33:6 where the word "not" is wrongly supplied; nor in his share in the land of Canaan, his posterity being seated on the other side of Jordan, at their request; nor did any persons of note and eminence spring from his tribe: because thou wentest up to thy father's bed, then defiledst thou it; referring to his incest with Bilhah, his father's concubine wife,Ge 35:22 which, though done forty years ago, was now remembered, and left an indelible spot on Reuben's character, and his posterity:he went up to my couch: turning himself to his other sons, to take notice of the crime, as very abominable and detestable; affirming the truth of it, and speaking of it with some vehemency, his affections being moved; and it may be could not bear to look at Reuben, but turned himself to his brethren; though he had forgiven the sin, and very probably Reuben had repented of it, and had forgiveness of God, which he might have, though in some sense vengeance was taken on this sinful invention of his, Ps 99:8.
There are various senses given of this phrase; some, as Aben Ezra, "my bed departed from me"; that is, he departed from his bed; or, as Kimchi , "it ceased to be my bed"; he left it, he abstained from the bed of Bilhah upon its being defiled by Reuben: and others separate these words, and read hle, singly, "it went up" ; either the excellency of Reuben went up, vanished and disappeared like smoke; or, as Ben Melech connects it with the beginning of the verse, "unstable as water", giving the sense, "it", the inundation of water, "ascended" and prevailed over thee; as waters ascend, meaning his lust ascended, and got the prevalence over him; but the accents will not admit of such a separation of the words; it is best to understand them in the first sense.
As to the manner of the expression, of going up to a bed, it may be observed, that not only their beds in those times might be raised higher than ours, but that they were placed in an higher part of the room, and so there was an ascent to them: and Dr.
Shaw says this is the custom of the eastern people to this day,"at one end of each chamber there is a little gallery, raised three, four, or five feet above the floor, with a balustrade in the front of it, with a few steps likewise leading up to it, here they place their beds.'