If people knew the reward of the Azan and the first row

People would draw lots for the Azan and the first row if they knew their reward.

Narrated by Abu Hurairah

If people knew what is in the call to prayer and the first row, and found no way to get it except drawing lots, they would draw lots. If they knew what is in coming early, they would race to it. And if they knew what is in Isha and Fajr, they would come to them even crawling.

Sahih al-Bukhari 615, Sahih Muslim 437

What this hadith teaches

Calling the Azan, standing in the first row and coming early are three hidden treasures many people leave.

Reference and grade

Grade
Sahih: agreed upon by al-Bukhari and Muslim
Narrator
Abu Hurairah

The hadith in Arabic نص الحديث

لَوْ يَعْلَمُ النَّاسُ مَا فِي النِّدَاءِ وَالصَّفِّ الأَوَّلِ، ثُمَّ لَمْ يَجِدُوا إِلاَّ أَنْ يَسْتَهِمُوا عَلَيْهِ لاَسْتَهَمُوا، وَلَوْ يَعْلَمُونَ مَا فِي التَّهْجِيرِ لاَسْتَبَقُوا إِلَيْهِ، وَلَوْ يَعْلَمُونَ مَا فِي الْعَتَمَةِ وَالصُّبْحِ لأَتَوْهُمَا وَلَوْ حَبْوًا

Arabic text of Sahih al-Bukhari 615, as given on sunnah.com.