Authors should ensure that they have written entirely original work, and if authors have used the work and/or words of others, these have been properly cited or quoted. Multiple, Redundant, or Concurrent Publication. An author generally should not publish a manuscript describing substantially the same research in more than one journal or major publication. Submitting the same manuscript to more than one journal at the same time is unethical and unacceptable publishing behavior. The journal Al Manhaj will actively check for plagiarism with the support of Turnitin. A maximum similarity of 20% will be tolerated.