By faith Jacob, when he was a dying, blessed both the sons of Joseph; and worshipped, leaning upon the top of his staff. Blessed both the sons of Joseph - That is, Ephraim and Manasseh. See the account and the notes. Genesis 48:5, etc.
Worshipped, leaning upon the top of his staff - This subject is particularly considered in the note, See Genesis 47:31 (note).
It appears, that at the time Joseph visited his father he was very weak, and generally confined to his couch, having at hand his staff; either that with which he usually supported his feeble body, or that which was the ensign of his office, as patriarch or chief of a very numerous family. The ancient chiefs, in all countries, had this staff or scepter continually at hand. See Homer throughout. It is said, Genesis 48:2, that when Joseph came to see his father Jacob, who was then in his last sickness, Israel strengthened himself, and sat upon the bed. Still I conceive he had his staff or scepter at hand; and while sitting upon the bed, with his feet on the floor, he supported himself with his staff. When Joseph sware to him that he should be carried up from Egypt, he bowed himself on his bed's head, still supporting himself with his staff, which probably with this last act he laid aside, gathered up his feet, and reclined wholly on his couch. It was therefore indifferent to say that he worshipped or bowed himself on his staff or on his bed's head. But as שחה shachah signifies, not only to bow, but also to worship, because acts of adoration were performed by bowing and prostration; and as מטה mittah, a bed, by the change of the vowel points becomes matteh, a staff, hence the Septuagint have translated the passage Και προσεκυνησεν Ισραηλ επι το ακρον της ῥαβδου αυτου· And Israel bowed or worshipped on the head of his staff. This reading the apostle follows here literatim.
Wretched must that cause be which is obliged to have recourse to what, at best, is an equivocal expression, to prove and support a favourite opinion. The Romanists allege this in favor of image worship. This is too contemptible to require confutation. To make it speak this language the Rheims version renders the verse thus: By faith Jacob dying, blessed every one of the sons of Joseph, and adored the top of his rod. A pretty object of adoration, indeed, for a dying patriarch! Here the preposition επι upon, answering to the Hebrew על al, is wholly suppressed, to make it favor the corrupt reading of the Vulgate. This preposition is found in the Hebrew text, in the Greek version of the Seventy, the printed Greek text of the New Testament, and in every MS. yet discovered of this epistle. It is also found in the Syriac, Ethiopic, Arabic, and Coptic: in which languages the connection necessarily shows that it is not an idle particle: and by no mode of construction can the text be brought to support image worship, any more than it can to support transubstantiation.