The story of Queen Madālasā is in Chapters 25-30 of the Mārkaṇḍeya Purāṇa. The Mārkaṇḍeya is one of the eighteen ‘great Purāṇas’ (Mahāpurāṇas) relating to Brahmā, said to have been narrated by the Riṛṣi Mārkaṇḍeya.
In this mythological tale, Queen Madālasā’s newborn child was named by the King. Upon hearing the name given by the King, the baby started to cry out loud. Madālasā sings this beautiful lullaby to pacify the child.
The Divine Lullaby
Translation
Why are you crying? 
You are pure 
The name you have acquired is not yours, merely a mind-created fiction applied to you 
The body is not you, nor are you of it 
The Lord of the universe doesn't cry either! 
This sound is an illusion attributed to you 
The qualities imagined as yours are inherent in all the senses 
The insignificant elements within the man acquire the condition of growth through the addition of food, water and drink 
It is not a growth or diminution of You 
Within the body shell 
You remain constant 
Do not become confounded by this body which has been fastened upon you 
Father, Son, Mother, Wife, Mine, Not Mine 
Do not assign much significance to what is only an aggregation of elements 
The deluded man thinks pains alleviate pain 
The deluded man thinks enjoyment of pleasures gives happiness 
The intelligent man whose mind is free from confusion knows pleasures and sorrows to be alike 
The carriage goes upon the earth, the body is seated in the carriage 
The Self resides within the body 
The deluded Jiva thinks "I am this body" 
The Self has no attachement to His carriage 
Foolish is such ignorance!