The Báb sent two messengers to Muhammad Shah, the King of Persia – one messenger with “a truly resplendent Tablet”, and another with “epistles” revealed by Him

This is an Epistle from Him Who is the true, the undoubted Leader. Herein is revealed the law of all things for those who fain would heed His Call or wish to be reckoned among them that are guided aright. Herein is enshrined the law of all things for such as would bear witness to the Revelation of thy Lord in accordance with this clear balance. Verily the ordinances of God concerning all things were formerly set forth in eloquent Arabic. Indeed those whose souls have been created through the splendor of the light of thy Lord recognize the Truth and are numbered with such as faithfully obey the One True God and are well assured.…

O Muhammad! The Decree of thy Lord was fulfilled four years ago; and ever since the inception of the Cause of thy Lord I have warned thee to fear God and not to be of the ignorant. I dispatched a messenger unto thee with a truly resplendent Tablet, but the followers of the devil turned him away disdainfully and interposed themselves between him and thee. They expelled him from the land whereof thou art the undisputed sovereign. Thus hath the good of this world and of the next escaped thee, unless thou submit to the commandment ordained by God and be of them that are rightly guided.

On My return from the sacred House of God [1] I sent thee a Message similar to, nay even greater than the one I had previously sent unto thee. Indeed God is the best protector and witness. I dispatched a messenger unto thee with epistles revealed by Me, that thou mightest obey the command of God and not be of them that have repudiated the Truth. The oppressor, however, committed a thing the like of which no one would commit, not even any of the wicked, nor anyone among the vile wrong-doers.… 

- The Báb  (From an epistle to Muhammad Shah; ‘Selections from the Writings of the Báb)

[1] The Ka‘bih in Mecca