Mishkat al-Masabih 2928
Sa'd b. al-Atwal said:
My brother died leaving three hundred dinars and some young children, and I wanted to use them for their maintenance, but God’s Messenger said to me, “Your brother is im-prisoned by his debt, so pay it on his behalf.” I went and did so, and returned to tell God’s Messenger that I had done it and that there remained only a woman who claimed two dinars but had no proof she could show. He replied, “Give them to her, for she is speaking the truth.” 

Ahmad transmitted it.
وَعَن سعد بن الأطول قَالَ: مَاتَ أَخِي وَتَرَكَ ثَلَاثَمِائَةِ دِينَارٍ وَتَرَكَ وَلَدًا صِغَارًا فَأَرَدْتُ أَنْ أُنْفِقَ عَلَيْهِمْ فَقَالَ لِي رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِن أخلك مَحْبُوسٌ بِدَيْنِهِ فَاقْضِ عَنْهُ» . قَالَ: فَذَهَبْتُ فَقَضَيْتُ عَنهُ وَلم تبْق إِلَّا امْرَأَةٌ تَدَّعِي دِينَارَيْنِ وَلَيْسَتْ لَهَا بَيِّنَةٌ قَالَ: «أعْطهَا فَإِنَّهَا صَدَقَة» . رَوَاهُ أَحْمد