Be careful in our actions and words when dealing with matters related to faith and religion ; Seek guidance from those more knowledgeable than us in such matters before taking any action ourselves ; Have proper understanding before taking any action related to faith or religion .

This hadith is about testing the apprehension of Dajjall. It is narrated by Abdullah ibn Sayyad who was walking with Allah's Messenger when they encountered Ibn Sayyad. To test his knowledge and apprehension of a certain matter, Allah's Messenger asked him to tell him something that he had concealed. When Ibn Sayyad answered correctly with 'Dukh', Allah's Messenger warned Umar not to harm him as he was the one they were apprehensive of - likely referring to Dajjall himself. This hadith teaches us that we should be careful in our actions and words when dealing with matters related to faith and religion as it can have serious consequences if done incorrectly or without proper knowledge or understanding. We should also be wary of those who claim special knowledge or power over religious matters and always seek guidance from those more knowledgeable than us in such matters before taking any action ourselves.