Taqaballahu minna wa minkum

When the companions of Allah’s Messenger met on the day of Eid, they would say to each other, ‘Taqaballahu minna wa minkum’ (may Allah accept (our efforts) from you and us).
—  Al-Haafidh Ibn Hajr Al-Asqalani related with a chain of narration that is hasan, from Jabyr ibn Nufayr. Al Mahamiliyyat, Fath ul Bari 2/446.