Musnad Ahmad 1153:1479

Yazid narrated to us, he said: Kahmas informed us, from Abdullah ibn Buraydah, he said: Aisha said: "O Messenger of Allah, if I encounter the Night of Decree (Laylat al-Qadr), what should I supplicate with?" He said: "Say: O Allah, indeed You are Pardoning, You love pardon, so pardon me."