Kabbalah do Rodzaju 49:26

Therefore, two females, his Mother and his wife, are to compass a man about in his house, like the Male above. There is reference to this in the verse “Unto {ad} the desire of the everlasting hills” {Gen. 49:26}. This ad is the desired object of the “everlasting hills,” by which is meant the supreme female, who is to make ready for him, and make him blissful and bless him, and also the lower female, who is to be joined in union with him and take support from him.