How Kumara (Kartikeya) was born, how he came to be known as the son of Agni and how he was begotten by Rudra (Shiva) on Ganga and Krittika?
कुमारश्च यथोत्पन्नो यथा चाग्नेः सुतोऽभवत्। यथा रुद्राच्च सम्भूतो गङ्गायां कृत्तिकासु च॥