<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  What is the significance of the Hajj in Islam? Context: The Hajj is a pilgrimage to Mecca that holds great spiritual significance in Islam and is mandatory for Muslims who are able to undertake it. Answer: [/INST]The Hajj is a pilgrimage to Mecca that all Muslims who are physically and financially able must undertake at least once in their lifetime. It is one of the Five Pillars of Islam and is considered a journey of spiritual significance and communal unity.</s>