חַ֥י חַ֛י ה֥וּא יוֹדֶ֖ךָ כָּמ֣וֹנִי הַיּ֑וֹם אָ֣ב לְבָנִ֔ים יוֹדִ֖יעַ אֶל־אֲמִתֶּֽךָ׃
Ang nabubuhay, ang nabubuhay, siya ang magpapasalamat sa Iyo, gaya ko sa araw na ito; ipababatid ng ama sa kanyang mga anak ang Iyong katapatan.
Rashi
The living, the living This is an expression denoting living people; i.e., when they are living people in the world, this one is living and this one is living, thanksgiving emanates from between them. [Other editions: A living one to a living one You are living, and it is proper to give thanksgiving to a living one.]
Ibn Ezra
The living, the living. The word חי living is repeated as if to say he who is living, as I do, or he who has recovered from illness. Shall praise thee, shall give thanks in words, in which soul and body appear to unite. According to some the first חי refers to God;37The translation of the words חי חי הוא יודך according to this explanation would be: O living God, he who liveth shall praise Thee. but there is no necessity for this assumption.
Rashi
of Your truth (lit., to your truth.) The father informs and directs his son’s thoughts to Your truth, to believe in You.