Is this dua authentic?

This dua is recorded in Tirmidhi 2922. Sunan Abi Dawud and Jami' at-Tirmidhi are part of the six canonical hadith collections; consult the explicit grading where given.

How many times should I recite this?

Where the hadith specifies a count, follow it. Otherwise, recite as often as you can with presence of heart — quality of attention matters more than quantity.

Protection

Evening Seeking Refuge

A protection supplication recorded in the Tirmidhi 2922 tradition.

أَعُوذُ بِاللَّهِ السَّمِيعِ الْعَلِيمِ مِنَ الشَّيْطَانِ الرَّجِيمِ

A'udhu billahis-sami'il-'aleemi minash-shaytanir-rajeem

Meaning

I seek refuge in Allah, the All-Hearing, the All-Knowing, from the accursed Satan.

Reference

Source: Tirmidhi 2922. Jami' at-Tirmidhi is part of the six canonical collections; Imam at-Tirmidhi graded each narration's strength explicitly.

When to recite

Recite this after a bad dream. The Prophet (peace be upon him) taught a small ritual: spit lightly to the left three times, recite the refuge, and turn over to the other side.

About this dua

Jami' at-Tirmidhi is another of the six canonical hadith collections. Imam at-Tirmidhi (d. 279 AH) graded each narration explicitly — most duas drawn from it are classified hasan (good) or sahih (authentic). The duas of refuge ('a'udhu...') invoke Allah's protection from named and unnamed harms. They're terse — often a single sentence — because they're meant to be reached for quickly, in moments of unease.

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Arabic text and references are presented as recorded in the source collections. For detailed authenticity grading or in-depth tafsir, consult a qualified scholar.