Hadith #4858 (Sunan Abi Dawud)
Book: General Behavior (Kitab Al-Adab)
Narrator(s): Abu Ahmed al-Mu'dab الحسين بن محمد بن بهرام - أبو علي المؤدب, al-Walid bin Abi Hisham الوليد بن أبي هشام زياد, al-Walid bin Muslim al-Quraishi الوليد بن مسلم القرشي, ibn Mas'ud, Isra'il bin Yonus bin Abi Ishaq إسرائيل بن يونس بن أبي إسحاق, Muhammad bin Yahya bin Faris al-Dhahli محمد بن يحيى بن فارس الذهلي, Muhammad bin Yusuf al-Faryabi محمد بن يوسف الفريابي, Zayd bin Za'id'h زيد بن زائدة ويقال, Zuhayr bin Harb زهير بن حرب بن شداد أبو خثيمة
Grade: Sahih

A similar tradition has also been transmitted by Abu Hurairah from the Prophet (ﷺ) through a different chain of narrators.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-4858/

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Hadith #4859 (Sunan Abi Dawud)
Book: General Behavior (Kitab Al-Adab)
Narrator(s): Abdullah bin 'Amr bin al-Faghwa' عبد الله بن عمرو بن الفغواء, Amr bin al-Faghwa', Ibn Ishaq محمد بن إسحاق بن يسار‎, Ibrahim bin Sa'd bin Ibrahim إبراهيم بن سعد بن إبراهيم, Isa bin Ma'mr Hjazy عيسى بن معمر حجازي, Muhammad bin Yahya bin Faris al-Dhahli محمد بن يحيى بن فارس الذهلي, Nwh bin Yazid bin Syar نوح بن يزيد بن سيار البغدادي
Grade: Hasan Sahih

When the Messenger of Allah (ﷺ) intended to get up from the assembly he used to say in the last. Glory be to Thee. O Allah, and I begin with praise of Thee, I testify that there is no god but Thou; I ask Thy pardon, and return to Thee in repentance. The man asked: Messenger of Allah! you utter the words now which you did not do in the past? He replied: (This is an) atonement for what takes place in the assembly.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-4859/

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Hadith #5195 (Sunan Abi Dawud)
Book: General Behavior (Kitab Al-Adab)
Narrator(s): Abu Umama bin Sahl, al-Dahhak bin Mukhlad Abu 'Asim al-Nabil الضحاك بن مخلد أبو عاصم النبيل, Muhammad bin Yahya bin Faris al-Dhahli محمد بن يحيى بن فارس الذهلي, Muhammad bin Ziyad al-Alhani محمد بن زياد الألهاني, Wahb bin Khalid al-Hmyry Abu وهب بن خالد الحميري
Grade: Sahih

A man came to the Prophet (ﷺ) and said: Peace be upon you! He responded to his salutation. He then sat down. The Prophet (ﷺ) said: Ten. Another man came and said: Peace and Allah’s mercy be upon you! He responded to his salutation when he sat down. He said: Twenty. Another man came and said: Peace and Allah’s mercy and blessings be upon you! He responded to him and said when he sat down: and blessings be upon you! He responded to him and said when he sat down: Thirty.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-5195/