The odd-numbered nights during the last ten nights of Ramadan are more likely than others, and the night of the 27th is the most likely to be Laylat al-Qadr.

Offering Tarawih prayer in congregation is something that is established by the Sunnah of the Prophet (peace and blessings be upon him).

The minimum number of rak`ahs for Tahajjud is two; there is no maximum limit for it. Prophet Muhammad (peace and blessings be upon him) prayed tahajjud as eight rak`ahs, then prayed Witr with three rak`ahs.

The last ten nights of Ramadan begin from the night before the twenty first day, whether the month is thirty days or is twenty-nine days. The odd-numbered nights of the last ten of Ramadan are the nights before the twenty-first, twenty-third, twenty-fifth, twenty-seventh and twenty-ninth (day).