Baha'i World Faith Sect 2 by -'Abdu'l-Bahá- 1 Para

In future, of course, certain people will come to you claiming faith; do not believe them nor trust them, unless after critical examination, search and investigation, and a long period of waiting, they shall appear to be faithful and truthful in word, confident in heart, attracted in spirit, pure in intention, patient in hardship, enduring the most severe tests; then associate with them. Because some sects will send certain men to mingle with you in order to throw suspicion upon those who are weak, therefore avoid them carefully. But let such be hidden that you may not become a cause of hindrance. (412:2)

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