On the authority of Zayd ibn Khālid al-Juhanī, that the Prophet ﷺ said: "Whoever performs ablution and does it well, then prays two rakʿahs in which he is not heedless, his previous sins will be forgiven." (1)

906 — ʿUthmān ibn Abī Shaybah narrated to us, Zayd ibn al-Ḥubāb narrated to us, Muʿāwiyah ibn Ṣāliḥ narrated to us, on the authority of Rabīʿah ibn Yazīd, on the authority of Abū Idrīs al-Khawlānī, on the authority of Jubayr ibn Nufayr al-Ḥaḍramī, on the authority of ʿUqbah ibn ʿĀmir al-Juhanī, that the Messenger of Allah ﷺ said: "There is no one who performs ablution and does it well, then prays two rakʿahs, turning his heart and face toward them, except that Paradise becomes obligatory for him." (2)

162 — Chapter on prompting the imam during the prayer

907 — Muḥammad ibn al-ʿAlāʾ and Sulaymān ibn ʿAbd al-Raḥmān al-Dimashqī narrated to us, both saying: Marwān ibn Muʿāwiyah informed us, on the authority of Yaḥyā al-Kāhilī—

(1) Ṣaḥīḥ by virtue of corroborating evidence; this chain is ḥasan in the context of follow-ups and witnesses. Hishām ibn Saʿd, although he has some weakness, is considered acceptable, and the rest of its narrators are trustworthy.
It is found in "Musnad Aḥmad" (17054).
It was also narrated by ʿAbd ibn Ḥumayd (280), al-Ṭabarānī (5242) and (5243), al-Ḥākim 1/131, and al-Baghawī in "Sharḥ al-Sunnah" (1013) via multiple routes from Hishām ibn Saʿd, with this chain.
It was also narrated by al-Ṭabarānī (5244) via Muḥammad ibn Abān, from Zayd ibn Aslam, with it. Muḥammad ibn Abān is weak in hadith, and al-Ḥākim also narrated it 1/131 via his route, from Zayd ibn Aslam, with it, but the companion was named as ʿUqbah ibn ʿĀmir.
It has a supporting witness from the hadith of ʿUqbah ibn ʿĀmir that follows.
And another from the hadith of ʿUthmān ibn ʿAffān in al-Bukhārī (1934) and Muslim (226), with the wording: "Whoever performs ablution like this ablution of mine, then prays two rakʿahs without letting his mind wander, his previous sins will be forgiven."

(2) A strong hadith, though this chain has some inconsistency in Zayd ibn al-Ḥubāb as previously explained under number (169). Abū Idrīs al-Khawlānī is ʿĀʾidh Allāh ibn ʿAbd Allāh.