Sayyiduna Ibn Mas'ud (may Allah be pleased with him) used to recite the verse: "Until the camel enters the eye of the needle" [Surah al-A'raf: 40], and he would say: "What is meant by it is the male mate of the she-camel."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8659