October 29. On this date in 1974, a letter written on behalf of the Universal House of Justice to a National Spiritual Assembly stated that "Covenant-breaking is a spiritual poison and the calumnies and distortions of the truth which the Covenant-breakers give out are such that they can undermine the faith of the believer and plant the seeds of doubt unless he is forearmed with an unshakable belief in Bahá'u'lláh and His Covenant and a knowledge of the true facts. Personal relations with Covenant-breakers, however, such as personal contact or entering into correspondence with one is strictly forbidden."

October 29. On this date in 1974, a letter written on behalf of the Universal House of Justice to a National Spiritual Assembly stated that "Covenant-breaking is a spiritual poison and the calumnies and distortions of the truth which the Covenant-breakers give out are such that they can undermine the faith of the believer and plant the seeds of doubt unless he is forearmed with an unshakable belief in Bahá'u'lláh and His Covenant and a knowledge of the true facts. Personal relations with Covenant-breakers, however, such as personal contact or entering into correspondence with one is strictly forbidden."

611. Personal Relations with Covenant-Breakers
"To read the writings of Covenant-breakers is not forbidden to the believers and does not constitute in itself an act of Covenant-breaking. Indeed, some of the Bahá'ís have the unpleasant duty to read such literature as part of their responsibilities for protecting the Cause of Bahá'u'lláh. However, the friends are warned in the strongest terms against reading such literature because Covenant-breaking is a spiritual poison and the calumnies and distortions of the truth which the Covenant-breakers give out are such that they can undermine the faith of the believer and plant the seeds of doubt unless he is forearmed with an unshakable belief in Bahá'u'lláh and His Covenant and a knowledge of the true facts.
"Personal relations with Covenant-breakers, however, such as personal contact or entering into correspondence with one is strictly forbidden. In this connection, however, it is important to remember two qualifications:
"First, the civil rights of Covenant-breakers must be scrupulously upheld. For example, if a Bahá'í owes a debt to a person who breaks the Covenant he must be sure that it is repaid and that his obligations are met.
"Secondly, although the believers are required to avoid, if possible, all contact with Covenant-breakers it sometimes happens that contact on business matters cannot be avoided. For example, in one city the head of the rate collection department was a Covenant-breaker. In such situations the believers should restrict their contact with the Covenant-breaker to a purely formal business level and to an absolute minimum."
(From a letter written on behalf of the Universal House of Justice to a National Spiritual Assembly, October 29, 1974)