Tevilat Keilim on Erev Tisha B'Av

Tevilat keilim (immersing vessels) on Erev Tisha B'Av is generally permitted, though there are some nuances worth knowing.

Yes, you may perform tevilat keilim (immersion of vessels in a mikveh) on Erev Tisha B'Av. There is no general prohibition against immersing vessels on that day. The restrictions of Erev Tisha B'Av primarily concern the seudah hamafseket (final meal before the fast), sitting on low chairs, and the general mourning atmosphere — not immersion of keilim.

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Key Takeaways

• Tevilat keilim is permitted on Erev Tisha B'Av — there is no specific prohibition against it.
• The restrictions of Erev Tisha B'Av focus on mourning practices, the final meal, and limiting pleasure — not on vessel immersion.
• If Erev Tisha B'Av falls on Shabbat, the situation changes — tevilat keilim becomes a separate Shabbat question.
• One should be careful about the timing — after chatzot (halachic midday) on Erev Tisha B'Av, some restrict certain activities.
• After the fast begins (Tisha B'Av itself), immersing keilim would be permissible since it involves no pleasure or melacha forbidden on the fast.

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Detailed Analysis

What Is Prohibited on Erev Tisha B'Av?

The restrictions that apply on Erev Tisha B'Av — especially from chatzot (midday) onward — include:

• Torah study (beyond what is permitted on Tisha B'Av itself)
• Sitting on regular chairs (some observe sitting low from chatzot)
• The seudah hamafseket — the final meal, which must be simple (bread, water/egg, cooked food)
• A general spirit of mourning and minimizing joy

None of these prohibitions touch on the immersion of vessels.

Why Tevilat Keilim Is Not Restricted

Tevilat keilim is a positive commandment derived from Numbers 31:23. The act of immersing vessels:

• Involves no melacha (forbidden labor)
• Is not a form of personal pleasure or indulgence
• Has no connection to the specific mourning practices of the Nine Days or Erev Tisha B'Av

The Nine Days restrictions (from Rosh Chodesh Av through Tisha B'Av) focus on areas like laundering, bathing for pleasure, eating meat, drinking wine, and haircuts — not on tevilat keilim.

Special Case: When Erev Tisha B'Av Falls on Shabbat

When Erev Tisha B'Av is Shabbat (as can happen when the 9th of Av is pushed to the 10th), immersing a vessel on Shabbat itself requires the standard Shabbat considerations:

• A vessel being immersed for the first time (to permit its use) may not be immersed on Shabbat according to most poskim (halachic authorities), since it appears as "fixing" the vessel — tikkun kli [Shulchan Aruch, Orach Chaim 323:7]
• In such a case, you should immerse it before Shabbat (i.e., Erev Shabbat/Erev Tisha B'Av)

Tisha B'Av Itself

On Tisha B'Av itself, tevilat keilim is also technically permitted since:

• It involves no bathing for pleasure (which is prohibited)
• It is not among the five inuyim (afflictions) of the fast — no eating/drinking, no washing for pleasure, no anointing, no leather shoes, no marital relations [Yoma 73b]

However, some are careful about doing unnecessary tasks on Tisha B'Av, so if you can immerse before the fast, that is preferable.

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For personal guidance on your specific situation, consult your local rabbi or posek.