Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says: The people of Yemen used to perform Hajj without taking provisions with them, saying: We are those who rely on Allah. They would come to Makkah for Hajj and beg from people, so Allah Almighty revealed this verse: "And take provisions, for indeed the best provision is God-consciousness (taqwa)." [Surah al-Baqarah: 197]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8650