And We have enjoined upon man, to his parents, good treatment. His mother carried him with hardship and gave birth to him with hardship, and his gestation and weaning (period) is thirty months. (He grows) until, when he reaches maturity and reaches (the age of) forty years, he says, "My Lord, enable me to be grateful for Your favour which You have bestowed upon me and upon my parents and to work righteousness of which You will approve and make righteous for me my offspring. Indeed, I have repented to You, and indeed, I am of the Muslims.

 (Surah Al-Ahqaf: ayah 15)