As quoted by Sripad Bhagavatapada Ananda Tirtha Madhwacarya (Dwadasa Stotram 8:7.) the four Kumaras, headed by Sanak Kumar said,
agrajam yah sasarajajamagryakrtim
vigraho yasya sarve guna eva hi
ugra adyo-pi yasyatmajagryatmajah
sadgrhitah sada yah param daivatam
"We are trying to satisfy Lord Vasudeva the creator of Brahma, the foremost
born and the presiding Deity over the whole 'mahat', Whose body is full
in all attributes, and Whose 'grandson' is Ugra (Rudra, Lord Brahma's first
born son). Vasudeva (Krsna) is always held by the devotees as the Supreme
Lord, who is the hub, or centre which around all devotees assemble."
On the refusal of the sons to obey the order of the father, there was much anger generated in the mind of Brahma which he tried to control but could not express. Although he tried to curb his anger, it came out between his eyebrows, and a child of mixed blue and red was immediately generated. Thus the Kumaras are known as the elder brothers of Lord Siva, Rudra. (Srimad Bhagavatam 4:22:6.) The following Srimad Bhagavatam verse was spoken by that Rudra;
yabadya asid guna-vigraho-dhisnyo bhagavan
yat-sambhavo 'ham tri-vrta sva tejasa vaikarikam tamasam aindriyam srje
ete vayam yasya vase mahat-manah stitah sakunta iva sutra-yantritah
mahan aham vaikrta-tamasendriyah srjama sarve yad-anugrahad idam
"From the Supreme Personality of Godhead appears Lord Brahma, whose body is made from the total material energy, the reservoir of intelligence predominated by the passionate mode of material nature. From Lord Brahma, I myself (Siva) am born as a representation of false ego known as Rudra. By my own power I create all other demigods, the five elements and the senses. Therefore I worship the Supreme Personality of Godhead, Who is greater than any of us and under Whose control are situated all the demigods, material elements and senses, and even Lord Brahma and I myself are like birds bound by a rope. Only by the Lord's grace can we create, maintain and annihilate the material world. Therefore I offer my respectful obeisances unto the Supreme Being."(Srimad Bhagavatam 5:17:23.).
sarvapapani yatsamsmrteh sanksayam
sarvadayanti bhaktya visuddhatmanam
kurvate karma yatpritaye sajjanah
devatamandala khanda mandanam
"We are trying to appease Vasudeva. Simply by remembrance of Him all
sins are vanquished and replaced by untinged devotional service. He is
the same Lord who appoints the various positions to numerous demigods beginning
with Brahma - (the 'guru' of Rudra and all others) - in this way the devotees
can perform their daily duties for the Lord for it is He who is the centre
of their attention."(Dwadasa Stotram 8:10.).
After Rudra's birth he began to cry: "O destiny maker, teacher of the universe, kindly designate my name and place." The all-powerful Brahma, who was born from the lotus flower, pacified the boy with gentle words, accepting his request and said, "Do no cry. I shall certainly do as you desire." Thereafter Brahma said: "O chief of the demigods, you shall be called by the name Rudra by all the people because you have so anxiously cried. My dear boy, I have already selected the following places for your residence: the heart, the senses, the air of life, the sky, the air, the fire, the water, the earth, the sun, the moon and austerity." Lord Brahma said: "My dear boy Rudra, you have eleven other names: Manyu, Manu, Mahinasa, Mahan, Siva, Rtadhwaja, Ugraseta, Bhava, Kala, Vamandeva and Dhrtavrata. O Rudra, you also have eleven wives, called Rudranis, and they are as follows: Dhi. Dhrti, Rasala, Uma, Niyut, Sarpi, Ila, Ambika, Iravati, Swadha and Diksa."
The most powerful Rudra, whose bodily colour was blue mixed with red, created many offspring resembling himself in features, strength and furious nature.