Very weak
graded by Al-Albani
Mishkat al-Masabih 1966
Narrator:Ibn ‘Abbās
وَعَنِ ابْنِ عَبَّاسٍ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا دَخَلَ شَهْرُ رَمَضَانَ أَطْلَقَ كُلَّ أَسِيرٍ وَأَعْطَى كُلَّ سَائِلٍ. رَوَاهُ الْبَيْهَقِيّ
Ibn ‘Abbas said that when the month of Ramadan began God's messenger set every prisoner free and gave to every beggar.
Cited in Mishkat al-Masabih (No. 1966).