The word(s) "تجهر" appears in 3 verse(s) in Quran.

(1) قُلِ ادْعُوا اللَّهَ أَوِ ادْعُوا الرَّحْمَـٰنَ ۖ أَيًّا مَّا تَدْعُوا فَلَهُ الْأَسْمَاءُ الْحُسْنَىٰ ۚ وَلَا تَجْهَرْ بِصَلَاتِكَ وَلَا تُخَافِتْ بِهَا وَابْتَغِ بَيْنَ ذَ‌ٰلِكَ سَبِيلًا

(سورة الإسراء, Al-Israa, Chapter #17, Verse #110)
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(2) وَإِن تَجْهَرْ بِالْقَوْلِ فَإِنَّهُ يَعْلَمُ السِّرَّ وَأَخْفَى

(سورة طه, Taa-Haa, Chapter #20, Verse #7)
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(3) يَا أَيُّهَا الَّذِينَ آمَنُوا لَا تَرْفَعُوا أَصْوَاتَكُمْ فَوْقَ صَوْتِ النَّبِيِّ وَلَا تَجْهَرُوا لَهُ بِالْقَوْلِ كَجَهْرِ بَعْضِكُمْ لِبَعْضٍ أَن تَحْبَطَ أَعْمَالُكُمْ وَأَنتُمْ لَا تَشْعُرُونَ

(سورة الحجرات, Al-Hujuraat, Chapter #49, Verse #2)
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