It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) would pray eight rak'ahs at night and pray three rak'ahs of witr.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12636
It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever hears the sound of a church bell, or enters a church, a place of worship, a fire temple or an idol house, and says: 'La ilaha illa Allah, wa la na'budu illa Allah' (There is no god worthy of worship but Allah, and we worship none but Allah), Allah will record for him a reward equal to the number of those who do not say it, or he will be recorded with Allah as a siddiq (truthful one)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12637