وَالْقِرَاءَةُ وَاجِبَةٌ فِي جَمِيعِ رَكَعَاتِ النَّفْلِ، وَفِي جَمِيعِ الْوِتْرِ.
Translation: Recitation is wajib in every rakah of nafl and every rakah of Witr.
Every pair of nafl rakahs has the legal character of a prayer, so even the third and fourth rakahs in a four-rakah nafl prayer require recitation.
Recitation is also required in every rakah of Witr; the last two fard-rakah option cannot be transferred to Witr.
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Voluntary Prayers: Regular Sunnahs, Nawafil and Juristic Differences
وَالْقِرَاءَةُ وَاجِبَةٌ فِي جَمِيعِ رَكَعَاتِ النَّفْلِ، وَفِي جَمِيعِ الْوِتْرِ.
Translation: Recitation is wajib in every rakah of nafl and every rakah of Witr.
Every pair of nafl rakahs has the legal character of a prayer, so even the third and fourth rakahs in a four-rakah nafl prayer require recitation.
Recitation is also required in every rakah of Witr; the last two fard-rakah option cannot be transferred to Witr.