Sahih Bukhari 6102

Narrated Abu Huraira: Allah's Apostle said, If a man says to his brother, O Kafir (disbeliever)!' Then surely one of them is such (i.e., a Kafir). ..

Narrated 'Abdullah bin 'Umar: Allah's Apostle said, 'If anyone says to his brother, 'O misbeliever! Then surely, one of them such. ..

Narrated Thabit bin Ad-Dahhak: The Prophet said, Whoever swears by a religion other than Islam (i.e. if he swears by saying that he is a non-Muslim in case he is telling a lie), then he is as he says if his oath is false and whoever commits..

Narrated Jabir bin `Abdullah: Mu`adh bin Jabal used to pray with the Prophet and then go to lead his people in prayer. Once he led the people in prayer and recited Surat-al-Baqara. A man left (the row of the praying people) and offered (light)..

Narrated Abu Huraira: Allah's Apostle said: Whoever amongst you swears, (saying by error) in his oath 'By Al-Lat and Al- Uzza', then he should say, 'None has the right to be worshipped but Allah.' And whoever says to his companions, 'Come let me..

Narrated Ibn `Umar: that he found `Umar bin Al-Khattab in a group of people and he was swearing by his father. So Allah's Apostle called them, saying, Verily! Allah forbids you to swear by your fathers. If one has to take an oath, he should swear..