Musnad Ahmad 1153:2180

'Abd al-Rahman narrated to us, he said: Jarir—meaning Ibn Hazim—narrated to me, from Harmalah al-Masri, from 'Abd al-Rahman ibn Shamasa, from 'Aishah, that the Messenger of Allah (may Allah bless him and grant him peace) said: "O Allah, whoever is entrusted with any affair of my Ummah and is gentle with them, then be gentle with him. And whoever makes it difficult for them, then make it difficult for him."