Sahih Bukhari
Oneness, Uniqueness of Allah (Tawheed)
Volume: 009 / Book Number: 093 / Hadith Number: 533
Narrated Anas bin Malik:
Allah's Apostle sent for the Ansar and gathered them in a tent and said to them, "Be patient till you meet Allah and His Apostle, and I will be on the lake-Tank (Al-Kauthar)."