«أَقُولُ لَهُ ارْحَلْ لَا تُقِيمَنَّ عِنْدَنَا»
I tell him, “Leave; do not remain with us.”
«وَإِلَّا فَكُنْ فِي السِّرِّ وَالْجَهْرِ مُسْلِمَا»
Otherwise, be compliant both privately and publicly.
The imperative «ارْحَلْ» asks the addressee to depart. The ensuing prohibition «لَا تُقِيمَنَّ عِنْدَنَا» presses the same practical point more emphatically, including a nūn of emphasis. The second expression clarifies and intensifies the first instead of conveying an unrelated command.