The holy spirit made known to Jacob that Joseph was coming to him,[361] and he strengthened himself, and sat upon the bed in order to pay due respect to the representative of the government. Though Joseph was his son, he was also viceroy, and entitled to special marks of honor. Besides, Jacob desired to make the impression of being a man in good health. He wanted to avoid the possibility of having his blessing of Joseph and Joseph's sons questioned as the act of an irresponsible person.[362] He strengthened himself spiritually as well as physically, by prayer to God, in which he besought Him to let the holy spirit descend upon him at the time of his giving the blessing to the sons of Joseph. When Joseph appeared in the company of his two sons, his father said to him: "In all the seventeen years thou hast been visiting me, thou didst never bring thy sons with thee, but now they have come, and I know the reason. If I bless them, I shall act in opposition to the word of God, who promised to make me the progenitor of twelve tribes, for if I adopt them as my sons, there will be fourteen tribes. But if I do not bless them, it will plunge thee in sorrow. So be it, I will bless them. But think not I do it because thou didst support me all these years. There is quite another reason.[363] When I left my father's house to go to Haran, I offered up a prayer at Beth-el, and I promised to give unto God the tenth of all I owned. So far as my material possessions are concerned, I kept my vow, but I could not give the tithe of my sons, because according to the law I had to withdraw from the reckoning the four sons, Reuben, Joseph, Dan, and Gad, that are the first-born children of their mothers. When I returned, God again appeared unto me in Beth-el, and He said, Be fruitful and multiply. But after this blessing no son was born unto me except Benjamin alone, and it cannot be but that God meant Manasseh and Ephraim when He spoke of 'a nation and a company of nations.' If now I have found favor in thy sight, thy two sons Ephraim and Manasseh, even as Reuben and Simon, shall be mine, and then I shall be able to give a tenth part of my ten sons unto the Lord, and I shall leave this world free from the sin of not keeping my vow to the Lord concerning the tithe-giving." Joseph consented to do his father's will, and Jacob tithed his sons, consecrating Levi to the Holy One, and appointing him to be the chief of his brethren. He enjoined his sons to have a care that there should never fail them a son of Levi in the priestly succession. And it happened that. of all the tribes Levi was the only one that never proved faithless to the covenant of the fathers.[364] Thus Jacob adopted Manasseh and Ephraim to be his own sons, even as Reuben and Simon were his sons. They were entitled like the others to a portion in the Holy Land, and like the others they were to bear standards on their journey through the desert.[365]