Plague is a calamity which was inflicted on those who were before you, or upon Bani Isra'il. So when it has broken out in a land, don't run out of it, and when it has spread in a land, then don't enter it.  

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ هَذَا الطَّاعُونَ رِجْزٌ سُلِّطَ عَلَى مَنْ كَانَ قَبْلَكُمْ أَوْ عَلَى بَنِي إِسْرَائِيلَ فَإِذَا كَانَ بِأَرْضٍ فَلاَ تَخْرُجُوا مِنْهَا فِرَارًا مِنْهُ وَإِذَا كَانَ بِأَرْضٍ فَلاَ تَدْخُلُوهَا  

Yahya related to me from Malik from Muhammad ibn al-Munkadir and from Salim ibn Abi'n-Nadr, the mawla of Umar ibn Ubaydullah that Amir ibn Sad ibn Abi Waqqas heard his father ask Usama ibn Zayd, "Have you heard anything from the Messenger of Allah ﷺ about the plague?" Usama said, "The Messenger of Allah ﷺ said, 'The plague is a punishment that was sent down on a party of the Banu Israil or whoever was before them. When you hear of it in a land, do not enter it. If it comes upon a land and you are in it, do not depart in flight from it.' " Malik said that Abu'n-Nadr said, "That is, do not depart with no other intention but flight."  

أَنَّهُ سَمِعَهُ يَسْأَلُ أُسَامَةَ بْنَ زَيْدٍ مَا سَمِعْتَ مِنْ رَسُولِ اللَّهِ ﷺ فِي الطَّاعُونِ فَقَالَ أُسَامَةُ قَالَ رَسُولُ اللَّهِ ﷺ الطَّاعُونُ رِجْزٌ أُرْسِلَ عَلَى طَائِفَةٍ مِنْ بَنِي إِسْرَائِيلَ أَوْ عَلَى مَنْ كَانَ قَبْلَكُمْ فَإِذَا سَمِعْتُمْ بِهِ بِأَرْضٍ فَلاَ تَدْخُلُوا عَلَيْهِ وَإِذَا وَقَعَ بِأَرْضٍ وَأَنْتُمْ بِهَا فَلاَ تَخْرُجُوا فِرَارًا مِنْهُ قَالَ مَالِكٌ قَالَ أَبُو النَّضْرِ لاَ يُخْرِجُكُمْ إِلاَّ فِرَارٌ مِنْهُ  

[Machine] From him, I heard the Messenger of Allah ﷺ saying, "Indeed, this is a punishment that Allah has sent upon people before you or a group from the Children of Israel. It comes sometimes and goes sometimes. So, when it occurs in a land, do not enter it, and when it occurs in your land, do not flee from it."  

عَنْهُ سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ إِنَّ هَذَا عَذَابٌ أَوْ كَذَا أَرْسَلَهُ اللهُ عَلَى نَاسٍ قَبْلَكُمْ أَوْ طَائِفَةٍ مِنْ بَنِي إِسْرَائِيلَ فَهُوَ يَجِيءُ أَحْيَانًا وَيَذْهَبُ أَحْيَانًا فَإِذَا وَقَعَ بِأَرْضٍ فَلَا تَدْخُلُوا عَلَيْهِ وَإِذَا وَقَعَ بِأَرْضٍ فَلَا تَخْرُجُوا فِرَارًا مِنْهُ  

What have you heard from Messenger of Allah ﷺ about plague? Thereupon Usama said: Messenger of Allah ﷺ said: Plague is a calamity which was sent to Bani Isra'il or upon those who were before you. So when you hear that it has broken out in a land, don't go to it, and when it has broken out in the land where you are, don't run out of it. In the narration transmitted on the authority of Abu Nadr there is a slight variation of wording. (Using translation from Muslim 2218a)   

سَمِعْتَ مِنْ رَسُولِ اللَّهِ ﷺ فِي الطَّاعُونِ؟ فَقَالَ أُسَامَةُ بْنُ زَيْدٍ قَالَ رَسُولُ اللَّهِ ﷺ «الطَّاعُونُ رِجْزٌ أُرْسِلَ عَلَى بَنِي إِسْرَائِيلَ أَوْ عَلَى مَنْ قَبْلَكُمْ فَإِذَا سَمِعْتُمْ بِهِ بِأَرْضٍ فَلَا تَقْدُمُوا عَلَيْهِ وَإِذَا وَقَعَ بِأَرْضٍ وَأَنْتُمْ بِهَا فَلَا تَخْرُجُوا فِرَارًا مِنْهُ»