Sunan At-Tirmidhi

Hadith #3265

Narrated At-Tufail bin Ubayy bin Ka'b:from his father, from the Prophet (ﷺ) (regarding this Ayah): 'And made them stick to the word of Taqwa (48:26).' He (ﷺ) said (the word is): ""La Ilaha Illallah