Guru Nanak took into one hand a quantity of Malik Bhago`s rich food and in the other a piece of Lalo`s coarse bread. He then squeezed both. From Lalo`s bread trickled milk, and from Malik Bhago`s blood. The moral was clear. The rich man`s wealth had been selfishly amassed at the cost of others and his charities were thus tainted, whereas Bhai Lalo`s simple bread earned by honest labour was holy. See LALO, BHAl
References :
1. Kohli, Surindar Singh, Janamsakhi Bhai Bala. Chandigarh, 1975
2. Kirpal Singh, Janam Sakhi Prampara. Patiala, 1969 S.S.B.