Messenger of Allah ﷺ said, "If anyone of you can get one rakʿa of the ʿAsr prayer before sunset, he should complete his prayer. If any of you can get one rakʿa of the Fajr prayer before sunrise, he should complete his prayer." (Using translation from Bukhārī 556)   

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا أَدْرَكَ أَحَدُكُمْ أَوَّلَ سَجْدَةٍ مِنْ صَلَاةِ الْعَصْرِ قَبْلَ أَنْ تَغْرُبَ الشَّمْسُ فَلْيُتِمَّ صَلَاتَهُ وَإِذَا أَدْرَكَ أَوَّلَ سَجْدَةٍ مِنْ صَلَاةِ الصُّبْحِ قَبْلَ أَنْ تَطْلُعَ الشَّمْسُ فَلْيُتِمَّ صَلَاتَهُ  

[Machine] "The Messenger of Allah ﷺ said: Ahmad ibn Salamah narrated to us, and Ishaq ibn Ibrahim al-Hanzhali narrated to us, and Abdul Aziz ibn Muhammad informed me, and Zaid ibn Aslam narrated to me, from Ata ibn Yasar and Busir ibn Saeed, and from Al-Araj, who reported from Abu Hurairah, that the Messenger of Allah ﷺ said: 'Whoever prays a unit of prayer before the sunrise and a unit of prayer after the sunrise, then he has indeed caught the morning prayer. And whoever prays a unit of prayer before the sunset and three units of prayer after the sunset, then he has indeed caught the afternoon prayer, and its meaning is...'"

Note: The passage is incomplete as the prompt requires me not to include the answer to the translation.  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ ح قَالَ أَحْمَدُ بْنُ سَلَمَةَ وَحَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ الْحَنْظَلِيُّ ثنا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ أَخْبَرَنِي زَيْدُ بْنُ أَسْلَمَ عَنْ عَطَاءِ بْنِ يَسَارٍ وَبُسْرُ بْنُ سَعِيدٍ وَعَنِ الْأَعْرَجِ يُحَدِّثُونَهُ عَنْ أَبِي هُرَيْرَةَ عَنْ رَسُولِ اللهِ ﷺ قَالَ مَنْ أَدْرَكَ مِنَ الصُّبْحِ رَكْعَةً قَبْلَ أَنْ تَطْلُعَ الشَّمْسُ وَرَكْعَةً بَعْدَ مَا تَطْلُعُ فَقَدْ أَدْرَكَ الصُّبْحَ وَمَنْ أَدْرَكَ رَكْعَةً مِنَ الْعَصْرِ قَبْلَ أَنْ تَغْرُبَ الشَّمْسُ وَثَلَاثًا بَعْدَمَا تَغْرُبُ فَقَدْ أَدْرَكَ الْعَصْرَ وَبِمَعْنَاهُ  

[Machine] The Prophet, ﷺ , said, "He who performs his prayer fully..."  

أَنَّ النَّبِيَّ ﷺ قَالَ يُتِمُّ صَلَاتَهُ  

[Machine] That the Messenger of Allah ﷺ said: Whoever prays a single unit of prayer before the sun rises, then the sun rises, let him pray another unit of prayer to it.  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ مَنْ صَلَّى مِنْ صَلَاةِ الصُّبْحِ رَكْعَةً قَبْلَ أَنْ تَطْلُعَ الشَّمْسُ فَطَلَعَتْ فَلْيُصَلِّ إِلَيْهَا أُخْرَى  

[Machine] On the authority of the Prophet ﷺ , he said: "When one of you prays a unit of the Fajr prayer and the sun rises, then let him pray another unit towards it."  

عَنِ النَّبِيِّ ﷺ قَالَ إِذَا صَلَّى أَحَدُكُمْ رَكْعَةً مِنْ صَلَاةِ الصُّبْحِ ثُمَّ طَلَعَتِ الشَّمْسُ فَلْيُصَلِّ إِلَيْهَا أُخْرَى  

[Machine] Abu Bakr prayed the morning prayer with us and recited Al-Imran. They said: "The sun is about to rise." He said: "If it had risen, you would not have found us heedless."  

صَلَّى بِنَا أَبُو بَكْرٍ صَلَاةَ الصُّبْحِ فَقَرَأَ آلَ عِمْرَانَ فَقَالُوا كَادَتِ الشَّمْسُ تَطْلُعُ قَالَ لَوْ طَلَعَتْ لَمْ تَجِدْنَا غَافِلِينَ  

[Machine] I prayed behind Umar until the Fajr prayer (the dawn prayer), and he did not finish until the men with intellects thought that the sun had risen. When he finished, they said, "O Amir al-Mu'minin (Commander of the Faithful), the sun was about to rise." He spoke something that I did not understand, so I asked, "What did he say?" They replied, "He said, 'If the sun had risen, you would not find us unattentive.'"  

صَلَّيْتُ خَلْفَ عُمَرَ ؓ الْفَجْرَ فَمَا سَلَّمَ حَتَّى ظَنَّ الرِّجَالُ ذَوُو الْعُقُولِ أَنَّ الشَّمْسَ قَدْ طَلَعَتْ فَلَمَّا سَلَّمَ قَالُوا يَا أَمِيرَ الْمُؤْمِنِينَ كَادَتِ الشَّمْسُ تَطْلُعُ قَالَ فَتَكَلَّمَ بِشَيْءٍ لَمْ أَفْهَمْهُ فَقُلْتُ أَيَّ شَيْءٍ قَالَ فَقَالُوا قَالَ لَوْ طَلَعَتِ الشَّمْسُ لَمْ تَجِدْنَا غَافِلِينَ