Sayyiduna Abu Barzah Aslami (may Allah be pleased with him) said: Towards the end (of his life), when the Messenger of Allah (peace and blessings be upon him) would sit in a gathering and intended to stand up, he would say: “«سُبْحَانَكَاَللّٰهُمَّ ...... أَتُوْبُإِلَيْكَ» O Allah! I declare Your purity with Your praise, I bear witness that there is no deity except You, I seek Your forgiveness and turn to You in repentance.” The people asked: O Messenger of Allah! Previously you did not say this which you now say? He replied: “This is an expiation for whatever occurred in the gathering.”
Hadith Referenceسنن دارمي / من كتاب الاستئذان / 2693
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده صحيح وأبو هاشم هو الرفاعي قيل: اسمه: يحيى بن دينار، [مكتبه الشامله نمبر: 2700]
That is, if there has been any conversation other than the remembrance of Allah or related to something else, then this supplication is its expiation.
From this hadith, it is understood that whenever a person rises from any gathering, if he recites this supplication, it will serve as an expiation for him.
Allah Ta'ala has also said: «﴿وَسَبِّحْبِحَمْدِرَبِّكَحِينَتَقُومُ﴾ [الطور : 48]» meaning, "When you stand up, glorify your Lord with His praise."