Authors must ensure that they have written entirely original work, and if the authors have used the work and/or words of others, then these have been properly cited or cited. Multiple, Redundant, or Concurrent Publications. An author generally should not publish a manuscript describing essentially 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 behaviour. Al Manhaj journal will actively check for plagiarism with the support of Turnitin. A maximum of 20% similarity will be tolerated.