Verse from Al'Quran
Do they not observe the birds above them, spreading their wings and folding them in? None can uphold them except (Allah) Most Gracious: Truly (Allah) Most Gracious: Truly it is He that watches over all things.
The Qur’an 67/19
Verse from Hadith
Do not argue your brother, do not kid him and do not promise him what you can not do.
Tirmizî, Birr, 58.