He also reported God’s Messenger as saying, “If any of you performs a <i>sajda</i> of the afternoon prayer before sunset, he should complete his prayer; and if he is present at a <i>sajda</i> of the Morning Prayer before sunrise, he should complete his prayer.” Bukhari transmitted it.

وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِذَا أَدْرَكَ أَحَدُكُمْ سَجْدَةً مِنْ صَلَاةِ الْعَصْرِ قَبْلَ أَنْ تَغْرُبَ الشَّمْسُ فَلْيُتِمَّ صَلَاتَهُ وَإِذَا أَدْرَكَ سَجْدَةً مِنْ صَلَاةِ الصُّبْحِ قَبْلَ أَنْ تَطْلُعَ الشَّمْسُ فَلْيُتِمَّ صَلَاتَهُ» . رَوَاهُ البُخَارِيّ