In وَانْحَرْ, nūn sākinah precedes ḥāʾ, one of the throat letters, so the rule is iẓhār ḥalqī. Keep the nūn distinctly articulated; do not assimilate or conceal it.
Earlier مِنْ شَرِّ required ikhfāʾ because the following letter was shīn. In both cases a nūn sākinah appears, but the following letter changes the rule. That is the central diagnostic skill.
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Al-Kawthar: nūn before ḥāʾ
Applied Tajwīd Diagnostics: Four Short Sūrahs
In وَانْحَرْ, nūn sākinah precedes ḥāʾ, one of the throat letters, so the rule is iẓhār ḥalqī. Keep the nūn distinctly articulated; do not assimilate or conceal it.
Earlier مِنْ شَرِّ required ikhfāʾ because the following letter was shīn. In both cases a nūn sākinah appears, but the following letter changes the rule. That is the central diagnostic skill.