﴿ وَٱلَّذِينَ يُتَوَفَّوْنَ مِنكُمْ وَيَذَرُونَ أَزْوَٰجًۭا وَصِيَّةًۭ لِّأَزْوَٰجِهِم مَّتَٰعًا إِلَى ٱلْحَوْلِ غَيْرَ إِخْرَاجٍۢ ۚ فَإِنْ خَرَجْنَ فَلَا جُنَاحَ عَلَيْكُمْ فِى مَا فَعَلْنَ فِىٓ أَنفُسِهِنَّ مِن مَّعْرُوفٍۢ ۗ وَٱللَّهُ عَزِيزٌ حَكِيمٌۭ ﴾

“AND IF any of you die and leave wives behind, they bequeath thereby to their widows [the right to] one year's maintenance without their being obliged to leave [the dead husband's home]. If, however, they leave [of their own accord], there shall be no sin in whatever they may do with themselves in a lawful manner. And God is almighty, wise.”

Please check ayah 2:242 for complete tafsir.