لَا تَنْهَرْ

لَا تَنْهَرْ is a verbal sentence (الجُمْلَةُ الفِعْلِيَّةُ) consisting of a jussive, past tense negative particle and a jussive, present tense verb

The natural state of the present tense verb is تَنْهَرُ however due to the presence of the jussive particle لَا that precedes it, it changes to تَنْهَرْ

SentenceParticle / VerbVerb Particle
الجُمْلَةُ الفِعْلِيَّةُحَرْفٌ جَزْمٌ وَفِعْلٌ مَجْزُوْمٌفِعْلٌ مُضَارِعٌ مَجْزُوْمٌ بِالسُّكُوْنِ الزَّاهِرَةِحَرْفٌ جَزْمٌ
verbal sentenceSentencea present or future tense jussive verba jussive, prohibitive particle
  
Don’t repelلَا تَنْهَرْ=تَنْهَرْ+لَا
Do not repelrepelDo not
Surah/Below are the 2 verses in the holy Quran containing the verbal sentenceلَا تَنْهَرْ
Verse
17-23
93-10And as for the one who asks, do not repelوَأَمَّا السَّآئِلَ فَلَا تَنْهَرْ