The Companions of Allāh’s Messenger (ﷺ) used to say to each other when they met on ‘Eid:

Taqabbalallāhu minnā wa minkum, which means ‘may Allāh accept from us and you [our fasts and deeds].’

Graded Hasan by Al-Ḥāfidh Ibn Ḥajr, Fatḥ Al-Bārī

Commentary:

This Hadith brings out the following two points:

1. Righteous deeds during the first ten days of the month of Dhul-Hijjah are far better and more rewarding than righteous deeds done on other days of the year, because they are Hajj days in the sacred season of pilgrimage. Because of their excellence and importance, Allah (عَزَّ وَجَلَّ) swore by them, thus: “By the Dawn; by the ten Nights…” (89:1-2)

2. Jihad has great eminence in Islam.