7:155
وَاخْتَارَ مُوسَى قَوْمَه ُُ سَبْعِينَ رَجُلا ً لِمِيقَاتِنَا فَلَمَّا أَخَذَتْهُمُ الرَّجْفَةُ قَالَ رَبِّ لَوْ شِئْتَ أَهْلَكْتَهُمْ مِنْ قَبْلُ وَإِيَّايَ أَتُهْلِكُنَا بِمَا فَعَلَ السُّفَهَاءُ مِنَّا إِنْ هِيَ إِلاَّ فِتْنَتُكَ تُضِلُّ بِهَا مَنْ تَشَاءُ وَتَهْدِي مَنْ تَشَاءُ أَنْتَ وَلِيُّنَا فَاغْفِرْ لَنَا وَارْحَمْنَا وَأَنْتَ خَيْرُ الْغَافِرِينَ
Wa Akhtāra Mūsá Qawmahu Sab`īna Rajulāan Limīqātinā Falammā 'Akhadhat/humu Ar-Rajfatu Qāla Rabbi Law Shi'ta 'Ahlaktahum Min Qablu Wa 'Īyāya 'Atuhlikunā Bimā Fa`ala As-Sufahā'u Minnā 'In Hiya 'Illā Fitnatuka TuĐillu Bihā Man Tashā'u Wa Tahdī Man Tashā'u 'Anta Walīyunā Fāghfir Lanā Wa Arĥamnā Wa 'Anta Khayru Al-Ghāfirīna 

And Moses selected from his people seventy men for Our appointed time; so when the earthquake seized them, he said: "My Lord, if You wished You could have destroyed them before this, and me as well. Will you destroy us for what the foolish among us have done? It is all Your test, You misguide with it whom You please and You guide with it whom You please. You are our Supporter, so forgive us and have mercy on us; You are the Best Forgiver."

9:80
اسْتَغْفِرْ لَهُمْ أَوْ لاَ تَسْتَغْفِرْ لَهُمْ إِنْ تَسْتَغْفِرْ لَهُمْ سَبْعِينَ مَرَّة ً فَلَنْ يَغْفِرَ اللَّهُ لَهُمْ ذَلِكَ بِأَنَّهُمْ كَفَرُوا بِاللَّهِ وَرَسُولِه ِِ وَاللَّهُ لاَ يَهْدِي الْقَوْمَ الْفَاسِقِينَ
Astaghfir Lahum 'Aw Lā Tastaghfir Lahum 'In Tastaghfir Lahum Sab`īna Marratan Falan Yaghfira Allāhu Lahum Dhālika Bi'annahum Kafarū Billāhi Wa Rasūlihi Wa Allāhu Lā Yahdī Al-Qawma Al-Fāsiqīna 

Whether you seek forgiveness for them, or do not seek forgiveness for them. If you seek forgiveness for them seventy times, God will not forgive them. That is because they have rejected God and His messenger; and God does not guide the wicked people.

69:32
ثُمَّ فِي سِلْسِلَة ٍ ذَرْعُهَا سَبْعُونَ ذِرَاعا ً فَاسْلُكُوهُ
Thumma Fī Silsilatin Dhar`uhā Sab`ūna Dhirā`āan Fāslukūhu 

Then, in a chain that is the length of seventy arms, tie him up.