Imam AbdulHay al-Lucknawi in his “Tuhfatul ahyar” (p 105) :

It was narrated from Ali that he said: May Allah enlighten the grave of Umar, like he enlighten upon us our mosques.  And from Abdurrahman as-Sulami that Ali called for reciters in the Ramadan, and ordered to two men to pray with people 20 rakahs. And Ali prayed with them Witr. And from Arfajah: Ali ordered people to stand (in the prayers) in Ramadan, and he set Imam for men and Imam for women. And Arfajah said: I was leading women, this was narrated by Beyhaki in his Sunnan.