1155. hadíth
وَ إِنَّ اَلنَّبِيَّ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ كَانَ ذَاتَ يَوْمٍ يَؤُمُّ أَصْحَابَهُ فَيَسْمَعُ بُكَاءَ اَلصَّبِيِّ فَيُخَفِّفُ اَلصَّلاَةَ.
The Prophet (saws) was leading his companions in prayer one day when he heard the crying of a child, so he shortened the prayer.