'Amir ibn Dinar said, "Ibn 'Abbas recited (this ayat), 'Consult with them about the matter.' (3:159)"  

عَنْ عَمْرِو بْنِ دِينَارٍ قَالَ قَرَأَ ابْنُ عَبَّاسٍ وَشَاوِرْهُمْ فِي بَعْضِ الامْرِ  

Al-Hasan said, "People never seek advice without being guided to the best possibility available to them." Then he recited, "and manage their affairs by mutual consultation." (42:38)  

عَنِ الْحَسَنِ قَالَ وَاللَّهِ مَا اسْتَشَارَ قَوْمٌ قَطُّ إِلاَّ هُدُوا لأَفْضَلِ مَا بِحَضْرَتِهِمْ ثُمَّ تَلاَ {وَأَمْرُهُمْ شُورَى بَيْنَهُمْ}