The Quran root ف ج ر f-j-r

أُحِلَّ لَكُمْ لَيْلَةَ الصِّيَامِ الرَّفَثُ إِلَىٰ نِسَائِكُمْ هُنَّ لِبَاسٌ لَّكُمْ وَأَنتُمْ لِبَاسٌ لَّهُنَّ عَلِمَ اللَّهُ أَنَّكُمْ كُنتُمْ تَخْتَانُونَ أَنفُسَكُمْ فَتَابَ عَلَيْكُمْ وَعَفَا عَنكُمْ فَالْآنَ بَاشِرُوهُنَّ وَابْتَغُوا مَا كَتَبَ اللَّهُ لَكُمْ وَكُلُوا وَاشْرَبُوا حَتَّىٰ يَتَبَيَّنَ لَكُمُ الْخَيْطُ الْأَبْيَضُ مِنَ الْخَيْطِ الْأَسْوَدِ مِنَ الْفَجْرِ ثُمَّ أَتِمُّوا الصِّيَامَ إِلَى اللَّيْلِ وَلَا تُبَاشِرُوهُنَّ وَأَنتُمْ عَاكِفُونَ فِي الْمَسَاجِدِ تِلْكَ حُدُودُ اللَّهِ فَلَا تَقْرَبُوهَا كَذَٰلِكَ يُبَيِّنُ اللَّهُ آيَاتِهِ لِلنَّاسِ لَعَلَّهُمْ يَتَّقُونَ ١٨٧

الْفَجْرِ l-fajri · [the] dawn

It has been made permissible for you the night preceding fasting to go to your wives [for sexual relations]. They are a clothing for you and you are a clothing for them. Allāh knows that you used to deceive yourselves, so He accepted your repentance and forgave you. So now, have relations with them and seek that which Allāh has decreed for you [i.e., offspring]. And eat and drink until the white thread of dawn becomes distinct to you from the black thread [of night]. Then complete the fast until the night [i.e., sunset]. And do not have relations with them as long as you are staying for worship in the mosques. These are the limits [set by] Allāh, so do not approach them. Thus does Allāh make clear His verses [i.e., ordinances] to the people that they may become righteous. (Surah Al-Baqarah, 2:187)

أَقِمِ الصَّلَاةَ لِدُلُوكِ الشَّمْسِ إِلَىٰ غَسَقِ اللَّيْلِ وَقُرْآنَ الْفَجْرِ إِنَّ قُرْآنَ الْفَجْرِ كَانَ مَشْهُودًا ٧٨

الْفَجْرِ l-fajri · at dawn

Establish prayer at the decline of the sun [from its meridian] until the darkness of the night and [also] the Qur’ān [i.e., recitation] of dawn. Indeed, the recitation of dawn is ever witnessed. (Surah Al-Isra, 17:78)

أَوْ تَكُونَ لَكَ جَنَّةٌ مِّن نَّخِيلٍ وَعِنَبٍ فَتُفَجِّرَ الْأَنْهَارَ خِلَالَهَا تَفْجِيرًا ٩١

فَتُفَجِّرَ fatufajjira · and cause to gush forth

Or [until] you have a garden of palm trees and grapes and make rivers gush forth within them in force [and abundance] (Surah Al-Isra, 17:91)

أَمْ نَجْعَلُ الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ كَالْمُفْسِدِينَ فِي الْأَرْضِ أَمْ نَجْعَلُ الْمُتَّقِينَ كَالْفُجَّارِ ٢٨

كَالْفُجَّارِ kal-fujāri · like the wicked

Or should We treat those who believe and do righteous deeds like corrupters in the land? Or should We treat those who fear Allāh like the wicked? (Surah Sad, 38:28)

وَقَالُوا لَن نُّؤْمِنَ لَكَ حَتَّىٰ تَفْجُرَ لَنَا مِنَ الْأَرْضِ يَنبُوعًا ٩٠

تَفْجُرَ tafjura · you cause to gush forth

And they say, "We will not believe you until you break open for us from the ground a spring (Surah Al-Isra, 17:90)

عَيْنًا يَشْرَبُ بِهَا عِبَادُ اللَّهِ يُفَجِّرُونَهَا تَفْجِيرًا ٦

تَفْجِيرًا tafjīran · abundantly

A spring of which the [righteous] servants of Allāh will drink; they will make it gush forth in force [and abundance]. (Surah Al-Insan, 76:6)