The dua of sehri and its detail is as follows:
Ramadan is a holy month for Muslims who believe that it teaches them to practice self-discipline, self-control, sacrifice, and empathy for those who are less fortunate. As a result, Muslims are encouraged to exercise actions of generosity and compulsory charity (zakat).
During this month, Allah Almighty showers his blessings, gives rewards, and benefits to all those Muslims who fast with full devotion and faith.
Dua of sehri:
The Muslims recite this dua (supplication) while starting their fast, and ask Allah that they have started the fast for Him during the holy month.
You may also like to see Dua for Iftar / Roza kholne ki dua (Supplication for breaking the fast)