Abdullah bin Abi Mulaykah (may Allah have mercy on him) said: One day Sayyidah Aishah (may Allah be pleased with her) was coming back from the direction of the graveyard. I said: O Mother of the Believers, where are you coming from? She said: I had gone to the grave of my brother, Abd al-Rahman bin Abi Bakr (may Allah be pleased with him). I said: Did the Messenger of Allah (peace and blessings be upon him) not forbid "visiting graves"? She said: "He (peace and blessings be upon him) did forbid it, but later he ordered that they be visited."
Only Bistam bin Muslim al-Basri narrated it, and Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 7207