Sahih Bukhari
Oppressions
Volume: 003 / Book Number: 043 / Hadith Number: 643
Narrated Al-Araj:
Abu Huraira said, "Allah's Apostle said, 'No-one should prevent his neighbor from fixing a wooden peg in his wall." Abu Huraira said (to his companions), "Why do I find you averse to it? By Allah, I certainly will narrate it to you."