4. Book of Fasting
٤۔ كِتَابُ الصَّوْمِ
When one of you is invited (to a meal), and he is fasting, he should say that he is fasting. (Using translation from Abū Dāʾūd 2461)
قَالَ رَسُولُ اللَّهِ ﷺ إِذَا دُعِيَ أَحَدُكُمْ إِلَى طَعَامٍ وَهُوَ صَائِمٌ فَلْيَقُلْ إِنِّي صَائِمٌ