so will you forsake part of what is divinely revealed to you and be disheartened because they say why has not a treasure been sent down along with him? or an angel should have come with him? you are purely a herald of warning* and allah is the guardian over all things. 
فلعلك تارك بعض ما يوحى إليك وضائق به صدرك أن يقولوا لولا أنزل عليه كنز أو جاء معه ملك إنما أنت نذير والله على كل شيء وكيل