Referring back to Quran and Sunnah ; Not taking personal opinions as evidence ; Being cautious about religious matters ; Following divine guidance over human opinion ; Seeking knowledge from reliable sources ; Taking responsibility for one’s actions/words/decisions etc.; Having faith in divine guidance etc..

This hadith highlights an important principle in Islamic jurisprudence, which is that when it comes to matters of religion, we should always refer back to the Quran and Sunnah. This means that even if someone has a personal opinion on something, it should not be taken as evidence or proof unless it is supported by what is found in either the Quran or Sunnah. Umar bin Al Khattab was emphasizing this point when he said that they cannot leave what Allah has revealed for something someone said without knowing whether they remembered correctly or not. This teaches us that we must always refer back to Allah's words and His Messenger's teachings before making any decisions about religious matters.