Corinthians 7:3–5 are not supported by the Torah and is therefore not binding

The passage you're thinking of is 1 Corinthians 7:3–5, where Paul writes about the responsibilities of husbands and wives toward one another. Verse 5 says (paraphrased):

"Do not deprive one another except perhaps by mutual agreement for a time, so that you may devote yourselves to prayer. Then come together again, so that Satan may not tempt you because of your lack of self-control."

Paul's advice is that married couples should not abstain from sexual relations for extended periods unless they both agree to do so temporarily for a spiritual purpose.

Is there an equivalent in the Torah?

There is no passage in the Torah that states this principle in the same way. However, there are related principles.

The closest is Exodus 21:10, which says that if a man takes another wife, he must not diminish the first wife's:

food,

clothing,

marital rights.

The Hebrew expression refers to her conjugal rights, indicating that a husband has an obligation not to neglect his wife in that respect.

Another related passage is Deuteronomy 24:5, where a newly married man is exempt from military service for one year so that he may remain at home and bring happiness to his wife. While it does not explicitly mention sexual relations, it reflects the Torah's concern for establishing and nurturing the marriage.

A notable difference

Paul presents temporary abstinence for prayer by mutual consent as acceptable. The Torah, however, does not contain a command or instruction encouraging married couples to abstain from sexual relations for spiritual reasons. Its emphasis is instead on fulfilling one's marital obligations and not neglecting one's spouse.

So, if you are asking whether Paul's specific instruction comes directly from the Torah, the answer is no. The Torah supports the principle that spouses owe each other marital faithfulness and conjugal rights, but it does not include Paul's teaching about mutually agreed periods of abstinence for prayer.