Narrated Anas: “That the Meccan people requested Allah’s Messenger (Muhammad; PBUH) to show them a miracle, and so he showed them the splitting of the moon.“
“The Hour has come near, and the moon has split [in two], And if they see a sign, they turn away, and say: Prolonged illusion, And they call (it) a lie, and follow their low desires; and every affair has its appointed term.“
`Umar (May Allah be pleased with him) said: I heard Messenger of Allah (sallallaahu ’alayhi wa sallam) saying: “If you all depend on Allah with due reliance, He would certainly give you provision as He gives it to birds who go forth hungry in the morning and return with full belly at dusk“. [At-Tirmidhi].
Commentary: Trust in Allah does not mean that one should not give any importance to material resources. What it really means is that along with their due importance, one should have full trust in Allah. Without His Will, material resources are of no avail. But nevertheless it is necessary to have material resources because their procurement is also ordained by Him. Birds do not keep sitting in their nests for food but fly out in search of it.