וַיְבָ֥רֶךְ אֶת־יוֹסֵ֖ף וַיֹּאמַ֑ר הָֽאֱלֹהִ֡ים אֲשֶׁר֩ הִתְהַלְּכ֨וּ אֲבֹתַ֤י לְפָנָיו֙ אַבְרָהָ֣ם וְיִצְחָ֔ק הָֽאֱלֹהִים֙ הָרֹעֶ֣ה אֹתִ֔י מֵעוֹדִ֖י עַד־הַיּ֥וֹם הַזֶּֽה׃
And he blessed Joseph, and said: ‘The God before whom my fathers Abraham and Isaac did walk, the God who hath been my shepherd all my life long unto this day,
Read kabbalistic (mystical) interpretation of Genesis 48:15: and classical mystical sources.