Hadith: Once, the Prophet (may Allah's peace and blessings be upon him) stood at the top of one of the forts of Madīnah looking down and said: Do you see what I see? Verily, I see the trials that occur in the midst of your houses as plenty as the raindrops that fall (during heavy rain)

عن أسامة بن زيد رضي الله عنهما قال: أشرفَ النبيُّ صلى الله عليه وسلم على أُطُم من آطام المدينة، فقال: «هل ترون ما أرى؟» قالوا: لا، قال: «فإنِّي لأرى الفتنَ تقع خِلال بيوتكم كوَقْع القَطْر».
[صحيح] - [متفق عليه]

Usāmah ibn Zayd (may Allah be pleased with him) reported: Once, the Prophet (may Allah's peace and blessings be upon him) stood at the top of one of Madīnah's forts looking down and said: "Do you see what I see? Verily, I see the trials that occur in the midst of your houses as plenty as the raindrops that fall (during heavy rain)."
[Authentic hadith] - [Narrated by Bukhari & Muslim]

Explanation

The Messenger (may Allah's peace and blessings be upon him) looked out from a high fort from the forts of Madīnah and said to his Companions: Do you see what I see? I see the trials and tribulations that occur in the midst of your houses as plenty and heavy as the raindrops. This is an indication to the wars and trials that were to occur in Madīnah after the Prophet’s death, such as the killing of ‘Uthmān, the battle of Al-Harrah, etc.