[Avodah] min hatorah

[Rich, Joel]

The Gemara chulin 17b asks "Minayin lbdikat sakin min hatorah" (from where do we know that a shechita knife must be checked) and answers with a pasuk from navi. I couldn't find another gemara that asks this question and answers with a pasuk not from the Torah. Thoughts?
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Through a data search I found two more:
Sanhedrin 91b... minayin l-tchias mesim min haTorah...Shir HaShirim 52:8
Bechoros 50a...Bikshu lignoz dinarei Hadriana, Tiryna, Shiappa mipnei tabah shel Yerushalayim, ad shamatsu lah mikrah min haTorah she-hu mutar...Yechezkel 7:22
And then ''remez min haTorah minayin:
Moed Kattan 5a...remez letsion kevaros min hatorah minayin...Yechezkel 39:15

Zvi Lampel
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And any thoughts on why Chazal would broadly define Torah in this way in such limited circumstances?
KT
Joel RIch

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