God hath removed the restrictions on travel that had been imposed in the Bayán.
The Báb decreed certain restrictions on travel which were to remain in force until the advent of the Promised One of the Bayán, at which time the believers were instructed to set out, even if on foot, to meet Him, since the attainment of His presence was the fruit and purpose of their very existence.

the School of Transcendent Oneness
In this verse and the ones which immediately follow it, Bahá’u’lláh confronts one of the reasons some of the Bábí­s rejected His claim to be the Promised One of the Bayán. Their rejection was based on a Tablet addressed by the Báb to "Him Who will be made manifest" on the reverse side of which the Báb had written: “May the glances of Him Whom God shall make manifest illumine this letter at the primary school.” This Tablet is published in Selections from the Writings of the Báb.
These Bábí­s maintained that, since Bahá’u’lláh was two years older than the Báb, it was not possible for Him to receive this Tablet “at the primary school”.
Bahá’u’lláh here explains that the reference is to events transpiring in the spiritual worlds beyond this plane of existence.