SB 1.6.6
ekatmaja me janani
yosin mudha ca kinkari
mayy atmaje ’nanya-gatau
cakre snehanubandhanam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
I was the only son of my mother, who was not only a simple woman but a maidservant as well. Since I was her only offspring, she had no other alternative for protection: she bound me with the tie of affection.