If anyone hears him who makes the call to prayer and is not prevented from joining the congregation by any excuse--he was asked what an excuse consisted of and replied that it was fear or illness--the prayer he offers will not be accepted from him. (Using translation from Abū Dāʾūd 551)
قَالَ رَسُولُ اللهِ ﷺ مَنْ سَمِعَ الْمُنَادِيَ فَلَمْ يَمْنَعْهُ مِنَ اتِّبَاعِهِ عُذْرٌ فَلَا صَلَاةَ لَهُ قَالُوا وَمَا الْعُذْرُ؟ قَالَ خَوْفٌ أَوْ مَرَضٌ