وَبِصَوْمِ غَدٍ نَوَيْتُ مِنْ شَهْرِ رَمَضَانَ
Wa bisawmi ghadin nawaitu min shahri Ramadan
I intend to fast tomorrow in the month of Ramadan.
The intention (niyyah) for fasting should be made before Fajr. It can be a verbal statement or simply the resolve in your heart. The Prophet ﷺ said: "Whoever does not make the intention to fast before Fajr, there is no fast for him."
Related Du'as
اللَّهُمَّ تَقَبَّلْ مِنَّا إِنَّكَ أَنْتَ السَّمِيعُ الْعَلِيمُ وَتُبْ عَلَيْنَا إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ
O Allah, accept from us, for You are the All-Hearing, the All-Knowing. And turn to us in mercy, for You are the Acceptor of repentance, the Most Merciful.
Sahihاللَّهُمَّ بَلِّغْنَا لَيْلَةَ الْقَدْرِ وَاجْعَلْنَا فِيهَا مِنَ الْمَقْبُولِينَ وَلَا تَحْرِمْنَا خَيْرَهَا وَاكْتُبْ لَنَا فِيهَا الْعِتْقَ مِنَ النَّارِ
O Allah, let us reach Laylatul Qadr, make us among the accepted in it, do not deprive us of its goodness, and decree for us in it freedom from the Fire.
Atharاللَّهُمَّ ارْحَمْنِي بِالْقُرْآنِ وَاجْعَلْهُ لِي إِمَامًا وَنُورًا وَهُدًى وَرَحْمَةً
O Allah, have mercy on me through the Quran, and make it for me a guide, a light, a source of guidance, and a mercy.
Hasanاللَّهُمَّ تَقَبَّلْ مِنَّا رَمَضَانَ وَأَعِنَّا عَلَى صِيَامِ سِتٍّ مِنْ شَوَّالٍ
O Allah, accept our Ramadan and help us fast six days of Shawwal.
Sahih