Chanukah ?? That sounds made up


(א) לפני ההדלקה מברכים:

(ב) בָּרוּךְ אַתָּה ה' אֱלֹקֵינוּ מֶלֶךְ הָעוֹלָם

(ג) אֲשֶׁר קִדְּשָׁנוּ בְּמִצְוֹתָיו וְצִוָּנוּ לְהַדְלִיק נֵר שֶׁל חֲנֻכָּה.

(1) Before lighting, we bless:

(2) Blessed are You, Lord our God, King

of the universe

(3) who has sanctified us with His commandments and commanded us to light the Chanukah candles.

Chanukah never appears in the Torah or the Tanakh.

It is the only post biblical holiday

What is the source for Chanukah?