Remember: Be on guard regarding negative speech whilst meeting others, and if you do slip up to ensure that you make dhikr as a means of payment of a penalty (kaffarah) for any negative speech that occurred.
The Messenger of Allah (Allah bless him and give him peace) – toward the latter part of his life – would say when departing from a gathering: Subhanak Allahumma wa bi hamdika, ashadu an la ilaha illa anta, astaghfiruka wa atubu ilayk. A man said: O Messenger of Allah! You now recite something that you did not in the past? He replied: this (dhikr) is a kaffarah for that which occurred in the gathering.”Abu Dawud
Some advice: Shaykh Muhiyyudin Ibn Arabi said: If you commit an act of disobedience against God in a place, then do not leave it until you perform a good action in that place, such as saying La ilaha illalah, subhanAllah, alhumdulillah. For just as a physical location can bear witness against you it can also bear witness in your favour on judgement day. Indeed Allah protects whom He wishes in the way that He wishes.