عَنْ أَنَسٍ قَالَ: مَا صَلَّيْتُ وَرَاءَ إِمَامٍ قَطُّ أَخَفَّ صَلَاةً وَلَا أَتَمَّ صَلَاةً مِنَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَإِنْ كَانَ لَيَسْمَعُ بُكَاءَ الصَّبِيِّ فَيُخَفِّفُ مَخَافَةَ أَنْ تُفْتَنَ أمه
Translation

Abu Qatada reported God’s Messenger as saying, “When I begin the prayer. I intend to make it long, but I hear a boy crying and shorten my prayer, being aware of his mother’s emotion because of his crying.” Bukhari transmitted it.