In the third and fourth rakʿahs, it is recommended that after al‑tasbīḥāt al‑arbaʿah one seeks forgiveness by saying, for example: أَسْتَغْفِرُ اللهَ رَبِّيْ وَأَتُوْبُ إِلَيْهِ astaghfirul lāha rabbī wa atūbu ilayh I seek forgiveness from Allah, My Lord, and I turn to Him in repentance....or: اَللّٰهُمَّ ٱغْفِرْ لِيْ allāhummagh fir lī O Allah! Forgive me.
If before seeking forgiveness and bending for rukūʿ one doubts whether or not he has recited Sūrat al-Ḥamd or said al‑tasbīḥāt al‑arbaʿah, he must recite Sūrat al-Ḥamd or say al‑tasbīḥāt al‑arbaʿah. If he doubts it while seeking forgiveness or after it, then again he must, based on obligatory precaution, recite Sūrat al-Ḥamd or say al‑tasbīḥāt al‑arbaʿah.