Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "Whoever among you is able, while praying, not to let anyone pass in front of him, let him do so, for the reward of the one who passes in front of a person praying is less than that of the one in front of whom he passes."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9255