Selections From the Writings of the Báb
Pages 66-67
 

"O YE concourse of the believers! Utter not words of ..."
 
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O YE concourse of the believers! Utter not words of denial against Me once the Truth is made manifest, for indeed the mandate of the Báb hath befittingly been proclaimed unto you in the Qur'án aforetime. I swear by your Lord, this Book is verily the same Qur'án which was sent down in the past. Chapter LXXXI.