Sa’eed bin Musayyib raĥimahullah reports that there were eighteen guidelines that Sayyidunā ‘Umar rađiyAllāhu ánhu formulated for the people, every one of which is replete with wisdom. He said,
(1) When someone disobeys Allah in matter that impacts on you, you can give him no punishment worse than obeying Allah in matters that impact on him.
(2) Always assume the best about your brother unless you learn something about him that you absolutely cannot reconcile.
(3) Never assume the worst about any statement that a Muslim makes as long as you are able to make a favourable interpretation.
(4) The person who exposes himself to slander must never rebuke anyone who holds a bad opinion of him.
(5) Whoever guards his secrets will retain the choice in his hands.
(6) Ensure that you keep true friends to stay under their wings because they are a source of beauty during times of prosperity and a means of protection during times of hardship.
(7) Always speak the truth even though it leads to your death.
(8) Never delve into matters that do not concern you.
(9) Do not ask about matters that have not occurred because that which has already taken place is enough to preoccupy you from that which has not.
(10) Never seek your needs from one who does not want to see your success.
(11) Never treat false oaths lightly because Allah will then destroy you.
(12) Never keep the company of the sinners to learn from their sinful ways.
(13) Keep away from your enemy.
(14) Beware even of your friends, except for the trustworthy one and none can be trustworthy unless he fears Allah.
(15) Be humble when in the graveyard,
(16) Submit to Allah’s obedience and
(17) Seek Allah’s protection at the time of disobeying His commands.
(18) Consult with those who fear Allah because Allah says:
From Allah’s bondsmen, it is only those with knowledge (those who recognise Him) who fear Him. [Sūrah Fātir, verse 28]
Muĥammad bin Shihāb reports that Sayyidunā ‘Umar rađiyAllāhu ánhu said,
Never delve into matters that do not concern you, keep your distance from your enemy and be cautious even of your friends unless he is a trustworthy person because nothing can compare with a trustworthy person. Never keep the company of a sinner because he will teach you his sinful ways and never disclose your secrets to him. Always consult with those who fear Allah.
 Kanz al-Ummal, vol. 8, pp. 235