Question: The good word is one of the five pillars of Islaam. Did the Messenger (peace be upon him) teach us that the good word is Laa ilaahaa illaa Allaah Muhammad rasool Allaah (there is no god but Allaah. Muhammad is the Messenger of Allaah), or just Laa ilaahaa illaa Allaah (there is no god but Allaah)? What do the Glorious Qur’aan and books of Saheeh (authentic) Hadeeths tell us in this regard? If the Qur’aan mentions the first formula, which Soorah is it in? What is the number of the Aayah (Qur’aanic verse)? Likewise, if the reliable books of Hadeeth confirm it, where can it be found? Please, mention the book, the page, and the categorical degree of relevant Hadeeth? Finally, do Muslims have the right to add any word or sentence to any Aayah or Saheeh Hadeeth specially if the addition is good and acceptable? What is the Sharee`ah (Islaamic law) ruling on this?
Answer: The good word is Laa ilaahaa illaa Allaah as you have mentioned in the question. It is one of the foundations upon which Islaam is built. Furthermore, it is the first of its pillars. The Prophet (peace be upon him) taught us this word and the other five pillars as well… read more here.