The Key to Paradise, Written by Sheikh Hafidh ibn Ahmed al-Hakami - مفتاح دار السلام بتحقيق شهادتي الإسلام

No deity is worthy of worship except Allah and Muhammad is the Messenger of Allah

The scholar Ibn Al Qayyim said in his work entitled: " Diseases and their remedies", p 456:

For this word the heavens and the earth were created. It is the sound nature with which Allah originally endowed all His creatures, and it forms the basis of religion. It is for her that the Qibla was erected... She is the privilege of Allah over all His servants. It preserves the blood, the goods and the descent in the dwelling here below. it assures salvation against the punishment of the grave and against that of Hell. She is the "proclamation" without which no one can enter Paradise. It is the indispensable cable that allows only those who cling to it to access the reward of Allah. It is the pillar on which rest the obligatory acts and the recommended acts, and "He whose last word is lâ ilâha illallâh will enter paradise.