[Machine] Allah, peace be upon Him, said, "Whoever makes a vow but does not mention its specifics, its expiation is like the expiation of an oath. And whoever makes a vow that they cannot fulfill, its expiation is also like the expiation of an oath. Ibn Musafer Al-Dhahhak bin Uthman did not mention it in his chain of narration." Abu Dawood said.
اللهِ ﷺ قَالَ مَنْ نَذَرَ نَذْرًا لَمْ يُسَمِّهِ فَكَفَّارَتُهُ كَفَّارَةُ يَمِينٍ وَمَنْ نَذَرَ نَذْرًا لَا يُطِيقُهُ فَكَفَّارَتُهُ كَفَّارَةُ يَمِينٍ لَمْ يَذْكُرِ ابْنُ مُسَافِرٍ الضَّحَّاكَ بْنَ عُثْمَانَ فِي إِسْنَادِهِ قَالَ أَبُو دَاوُدَ