You don't need to scan the entire Tanach. You only need to look at the language of the Torah itself.
It is first necessary to emphasize that the word Yetzer (יצר) means to form or fashion something from something else which preceded it.
Bereshit 2:9 states explicitly:
וַיַּצְמַ֞ח יְהוָ֤ה אֱלֹהִים֙ מִן־הָ֣אֲדָמָ֔ה כָּל־עֵ֛ץ נֶחְמָ֥ד לְמַרְאֶ֖ה וְט֣וֹב לְמַאֲכָ֑ל וְעֵ֤ץ הַֽחַיִּים֙ בְּת֣וֹךְ הַגָּ֔ן וְעֵ֕ץ הַדַּ֖עַת ט֥וֹב וָרָֽע׃
That there is a specific tree in the midst of G-d's garden that was comprised of a union of Tov and Rah. And it only emphasizes this about a single tree. All the other trees were desirable in appearance and comprised of good only, for use as food.
In Bereshit 3:5 it goes on to say:
כִּ֚י יֹדֵ֣עַ אֱלֹהִ֔ים כִּ֗י בְּיוֹם֙ אֲכָלְכֶ֣ם מִמֶּ֔נּוּ וְנִפְקְח֖וּ עֵֽינֵיכֶ֑ם וִהְיִיתֶם֙ כֵּֽאלֹהִ֔ים יֹדְעֵ֖י ט֥וֹב וָרָֽע׃
The Nachash reported to Chava, Adam's wife, that when they eat the fruit from this tree which is a mixture of Tov and Rah, they will acquire its quality. In other words, you are, or become, what you eat.
This too is the plain meaning of the text. If you eat healthy things, your physical body as well as your intellectual and emotional traits absorb and incorporate the healthy elements of the food. If you consume unhealthy things, the opposite happens.
This means that originally, Adam and Chava were desireable in appearance and comprised of good only. They had not eaten from the Tree of Knowledge of Tov and Rah. Only after consuming the fruit of that tree which contained a mixture of Tov and Rah, did they acquire that dual nature.
And then further in the Torah, in Devarim 20:19 which says:
כִּֽי־תָצ֣וּר אֶל־עִיר֩ יָמִ֨ים רַבִּ֜ים לְֽהִלָּחֵ֧ם עָלֶ֣יהָ לְתָפְשָׂ֗הּ לֹֽא־תַשְׁחִ֤ית אֶת־עֵצָהּ֙ לִנְדֹּ֤חַ עָלָיו֙ גַּרְזֶ֔ן כִּ֚י מִמֶּ֣נּוּ תֹאכֵ֔ל וְאֹת֖וֹ לֹ֣א תִכְרֹ֑ת כִּ֤י הָֽאָדָם֙ עֵ֣ץ הַשָּׂדֶ֔ה לָבֹ֥א מִפָּנֶ֖יךָ בַּמָּצֽוֹר׃
It emphasizes this same concept in the prohibition against cutting down the surrounding fruit trees when making war against a city because you may come to eat those fruit in the future. And it states plainly that a human being is a tree in the field. You incorporate the qualities of the fruit from those trees which you eat and become like them.
And in case this idea seems confusing, it is also emphasized in Devarim 1:39 when Moshe explains who will be permitted to enter the land of Israel, who will not enter and why.
וְטַפְּכֶם֩ אֲשֶׁ֨ר אֲמַרְתֶּ֜ם לָבַ֣ז יִהְיֶ֗ה וּ֠בְנֵיכֶם אֲשֶׁ֨ר לֹא־יָדְע֤וּ הַיּוֹם֙ ט֣וֹב וָרָ֔ע הֵ֖מָּה יָבֹ֣אוּ שָׁ֑מָּה וְלָהֶ֣ם אֶתְּנֶ֔נָּה וְהֵ֖ם יִירָשֽׁוּהָּ׃
That at the Giving of the Torah, the effect from the Tree of Knowledge of Tov and Rah which had been acquired by Adam and Chava was removed from the nation of Israel. And in that 40 day time period while Moshe was on Mount Sinai, one of the four time categories for length of pregnancy mentioned in the Oral Torah, children were conceived who did not have the quality of that mixture of Tov and Rah. And ultimately, those children were among the ones permitted to enter the Land of Life, the Land of Israel.