Hadith 350
´It was narrated that Muhajir bin Qunfudh bin (Umair) bin Jud'an said:` "I came to the Prophet when he was performing ablution and greeted him with the Salam, but he did not return (the greeting). When he had finished his ablution he said: 'Nothing prevented me from returning your greeting but the fact that I need to have ablution.'" (Da'if) Another chain with similar wording.
Hadith 2571
´Hudain bin Mundhir said:` “When Walid bin `Uqbah was brought to `Uthman, they had testified against him. He said to 'Ali: 'You are close to your uncle's son, so carry out the legal punishment on him.' So 'Ali whipped him. He said: 'The Messenger of Allah (ﷺ) gave forty lashes, and Abu Bakr gave forty lashes, and 'Umar gave eighty all are Sunnah.'”