...Concerning the meaning of "Resurrection": although this term is often used by Baha'u'llah in His Writings, as in the passage quoted in your letter, its meaning is figurative. The tomb mentioned is also allegorical, i.e. the tomb of unbelief. The Day of Resurrection, according to Baha'i interpretation, is the Judgement Day, the Day when unbelievers will be called upon to give account of their actions, and whether the world has prevented them from acknowledging the new Revelation.
The passage in Baha'u'llah's Tablet in which He explains the Sura of "The Sun" should not be interpreted literally. It does not mean that after the Day of Resurrection praise and peace will cease to be vouchsafed to the Prophet. Rather it means to the end of time, i.e. indefinitely and for all times.
The intercession spoken of by Baha'u'llah in one of His prayers which you have quoted is a purely spiritual act and is applicable to Muhammad as well as to all Prophets. This passage, however, refers more particularly to that kind of intercession in which Muslims believe, though the manner and circumstances of it, according to Baha'i belief, are mysterious and unknowable.