It is narrated from Sayyiduna Abu Darda (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Bring to me your weak ones, for you are only provided sustenance and granted help because of your weak ones.
Hadith Referenceالفتح الربانی / كتاب الجهاد / 5027
Benefits: … Allah Ta'ala wants to provide sustenance to these weak ones and desires their well-being, but since they are dependent on you, therefore Allah Ta'ala also gives you sustenance in order to deliver sustenance to them, and He also assists you for their benefit.