Ameer-e-Ahle sunnat's Advise to children

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Some children have the habit of sucking their thumb, this is not a good habit because due to this, 
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The honourable Ameer-e-Ahl-e-Sunnat, Maulana Ilyas Qadiri دَامَـتْ بَـرَكَـاتُـهُـمُ الْـعَـالِـيَـهْ says:
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Most children like to eat toffees, chocolates, snow cones and other colourful sweet things.
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The beloved Ameer of Ahl-us-Sunnah, Maulana Muhammad Ilyas Qaadiri دَامَـتْ بَـرَكَـاتُـهُـمُ الْـعَـالِـيَـهْ says:
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Our beloved Ameer-e-Ahl-e-Sunnat Maulana Ilyas Qaadiri دَامَـتْ بَـرَكَـاتُـهُـمُ الْـعَـالِـيَـهْ says:
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Dear children! Love your mother & father, respect and honour them greatly, serve them, accept every permissible saying of theirs,
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Dear children! Allah Almighty is our creator.
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Dear children! Eid is the day of thanksgiving and showing ‘happiness and joy’.
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Question 1: In which Ayah has it been mentioned that fasting has been made obligatory?