March 27. On this date in 1916, 'Abdu'l-Bahá wrote his "Tablet to the Bahá’ís of the Southern States," which is the 2nd part of his "Tablets of the Divine Plan," in the garden adjacent to the Shrine of Bahá’u’lláh, and addressed to the Bahá’ís of sixteen Southern States of the United States.

March 27. On this date in 1916, 'Abdu'l-Bahá wrote his Tablet to the Bahá’ís of the Southern States, which is the 2nd part of his Tablets of the Divine Plan, in the garden adjacent to the Shrine of Bahá’u’lláh, and addressed to the Bahá’ís of sixteen Southern States of the United States: Delaware, Maryland, Virginia, West Virginia, North Carolina, South Carolina, Georgia, Florida, Alabama, Mississippi, Tennessee, Kentucky, Louisiana, Arkansas, Oklahoma and Texas. Included in multiple books, the first five tablets were printed in America in Star of the West - Vol. VII, No. 10, September 8, 1916, and all the tablets again after World War I in Vol. IX, No. 14, November 23, 1918.

On December 23, 1918, 'Abdu'l-Bahá sent his secretary Ahmad Sohrab to the United States to personally deliver the Tablets of the Divine Plan. These collective letters, along with Bahá’u’lláh’s Tablet of Carmel and ‘Abdu’l-Bahá's Will and Testament were described by Shoghi Effendi as "three of the Charters" of the Bahá’í Faith, which along with the Kitáb-i-Aqdas (which Shoghi Effendi described as "the basic laws and ordinances on which the fabric of His future World Order must rest") set the foundation of the Administrative Order. Ahmad Sohrab would later be declared a Covenant-breaker by Shoghi Effendi.

O ye heralds of the Kingdom of God:
A FEW days ago an epistle was written to those divine believers, but because these days are the days of Naw-Rúz, you have come to my mind and I am sending you this greeting for this glorious feast. All the days are blessed, but this feast is the national fête of Persia. The Persians have been holding it for several thousand years past. In reality every day which man passes in the mention of God, the diffusion of the fragrances of God and calling the people to the Kingdom of God, that day is his feast. Praise be to God that you are occupied in the service of the Kingdom of God and are engaged in the promulgation of the religion of God by day and by night. Therefore all your days are feast days. There is no doubt that the assistance and the bestowal of God shall descend upon you.
In the Southern States of the United States, the friends are few, that is, in Delaware, Maryland, Virginia, West Virginia, North Carolina, South Carolina, Georgia, Florida, Alabama, Mississippi, Tennessee, Kentucky, Louisiana, Arkansas, Oklahoma and Texas. Consequently you must either go yourselves or send a number of blessed souls to those states, so that they may guide the people to the Kingdom of Heaven. One of the holy Manifestations, addressing a believing soul, has said that, if a person become the cause of the illumination of one soul, it is better than a boundless treasury. “O ‘Alí! If God guide, through thee, one soul, it is better for thee than all the riches!” Again He says, “Direct us to the straight path!” 1 that is, Show us the right road. It is also mentioned in the Gospel: Travel ye to all parts of the world and give ye the glad tidings of the appearance of the Kingdom of God. 2
In brief, I hope you will display in this respect the greatest effort and magnanimity. It is assured that you will become assisted and confirmed. A person declaring the glad tidings of the appearance of the realities and significances of the Kingdom is like unto a farmer who scatters pure seeds in the rich soil. The spring cloud will pour upon them the rain of bounty, and unquestionably the station of the farmer will be raised in the estimation of the lord of the village, and many harvests will be gathered.
Therefore, ye friends of God! Appreciate ye the value of this time and be ye engaged in the sowing of the seeds, so that you may find the heavenly blessing and the lordly bestowal. Upon you be Bahá’u’l-Abhá!

1. Qur’án 1:6
2. Cf. Mark 16:15.