Amir bin Saad bin Abu Waqqas reported,
His brother Umar set out to visit Saad, who was tending his sheep outside Madinah. When Saad saw him, he said, "I seek refuge in Allah from the evil of this rider."When Umar reached him, he said, "Father, are you content to be a bedouin among your sheep while people in Madinah are contending over rulership?"Saad struck Umar's chest and said, "Be quiet! I heard the Messenger of Allah ﷺ say, 'Allah 
loves the servant who is God-fearing, self-sufficient, and unnoticed.'"
Ahmad 1441
Sahihحدثنا أبو بكر الحنفي عبد الكبير بن عبد المجيد حدثنا بكير بن مسمار
عن عامر بن سعد
أن أخاه عمر انطلق إلى سعد في غنم له خارجا من المدينة فلما رآه سعد قال أعوذ بالله من شر هذا الراكب فلما أتاه قال يا أبت أرضيت أن تكون أعرابيا في غنمك والناس يتنازعون في الملك بالمدينة فضرب سعد صدر عمر وقال اسكت إني سمعت رسول الله ﷺ يقول إن الله عز وجل يحب العبد التقي الغني الخفي
No references are available.
Its isnad is sahih. Abu Bakr Hanafi, Abdul-Kabir bin Abdul-Majid, was a Basran, trustworthy, one of the teachers of Ahmad. His kunya is given in al-Tahdhib as Abu Yahya, but this is an error in copying or printing, and it is mentioned correctly in al-Taqrib.Bukayr bin Mismar, the client of Saad bin Abu Waqqas, was trustworthy. Ajli confirmed his trustworthiness, and Bukhari said in al-Kabir 1/2/115, "... some reservation." Muslim included him in his narrations.The hadith was narrated by Muslim, 2:385, from Ishaq bin Ibrahim, from Abu Bakr Hanafi.Saad's intuition about his son Umar proved true, for he sought refuge with Allah from his evil. Perhaps he knew of his tendency toward political sedition and his craving for authority. So it happened that this Umar was tried by involvement in the greatest sedition. Ubaydullah bin Ziyad appointed him over al-Rayy and Hamadan. Then, when Husayn bin Ali came to Iraq, he ordered him to go out and fight him. He refused at first, but then obeyed when Ibn Ziyad threatened to remove him from his post and demolish his house. So he ended up leading the army that killed Husayn.Then Allah took vengeance for him. When Mukhtar bin Abu Ubayd gained control of Kufa, he killed Umar bin Saad and his son Hafs.See al-Tahdhib, 7:450–452, and Ibn Saad, 5:125.