You will be from the people of Paradise If you say sincerely

(Allaahumma anta rabbiy laa ilaaha illaa anta, khalaqtanee wa ana ‛abduka, wa ana alaa ahdika wa wa‛dika masta-ṭa‛tu a‛oodhu bika min sharri maa ṣana‛tu, aboo’u laka bi ni‛matika ‛alayya wa aboo’u bi dhambee, faghfir lee fa innahu laa yaghfir-udh-dhunooba illaa ant).

“O Allah, You are my Lord, none has the right to be worshipped except You, You created me and I am Your slave and I abide to Your covenant and promise as best as I can, I seek refuge with You from the evil of which I have committed. I acknowledge Your favour upon me and I acknowledge my sin, so forgive me, for verily none can forgive sin except You . If somebody says it during the day with firm faith in it, and dies on the same day before the evening, he will be from the people of Paradise; and if somebody says it at night with firm faith in it, and dies before the morning, he will be from the people of Paradise.”

Bukhari 6306; Abu Dawud 5070; Tirmidhi 3393