Mbh 6.122.1a

Sanjaya said,--“Stringing then his large bow and reverentially saluting the grandsire, Arjuna, with eyes filled with tears, said these words, O foremost one among the Kurus, O thou that art the first among all wielders of weapons, command me, O invincible one, for I am thy slave! What shall I do, O grandsire!--Unto him Santanu’s son said,--‘My head, O sire, hangeth down!--O foremost one among the Kuru’s! O Phalguni, get me a pillow! Indeed, give me one without delay, O hero, that would become my bed! Thou O Partha, art competent, thou art the foremost of all wielders of bows! Thou art conversant with the duties of Kshatriyas and thou art endued with intelligence and goodness!’--Then Phalguni, saying,--‘So be it’--desired to do Bhishma’s bidding. Taking up Gandiva and a number of straight shafts, and inspiring them with mantras, and obtaining the permission of that illustrious and mighty car-warrior of Bharata’s race, Arjuna then, with three keen shafts endued with great force, supported Bhishma’s head. Then that chief of the Bharatas, viz., Bhishma of virtuous soul, conversant with the truths of religion, seeing that Arjuna, having divined his thought, had achieved that feat, became highly gratified. And after that pillow had thus been given to him, he applauded Dhananjaya. And casting his eyes upon all the Bharatas there, he addressed Kunti’s son Arjuna, that foremost of all warriors, that enhancer of the joys of his friends and said,--‘Thou hast given me, O son of Pandu, a pillow that becometh my bed! If thou hadst acted otherwise, I would have cursed thee, from wrath! Even thus, O mighty-armed one, should a Kshatriya, observant of his duties, sleep on the field of battle on his bed of arrows!’--Having addressed Vibhatsu thus, he then said unto all those kings and princes that were present there, these words:--‘Behold ye the pillow that the son of Pandu hath given me! I will sleep on this bed till the Sun turneth to the northern solstice!