Intention is important in worshipping. Intending from the heart is essential and better than oral intention. For this reason, intending to fast means that a person should be aware of fasting. Waking up for sahur (meal eaten before dawn) is an actual intention for fasting. Even if a person does not wake up for sahur, he is deemed to have intended if they have such awareness.

The time for intention to fast begins with the time of evening prayer.

The deadline of intention for Ramadan fast, additional and vowing fasts lasts till an hour before the time for the noon prayer. Apart from these, intention for kaffarah and qada fasts and vowing fasts of which the exact time is not determined should be made before the time of morning prayer.