Srimad Bhagavatam Canto 08, Chapter 07, Text 10

SB 8.7.10

surasurendrair bhuja-virya-vepitam
 paribhramantam girim anga prsthatah
bibhrat tad-avartanam adi-kacchapo
 mene ’nga-kanduyanam aprameyah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
O King, when the demigods and demons, by the strength of their arms, rotated Mandara Mountain on the back of the extraordinary tortoise, the tortoise accepted the rolling of the mountain as a means of scratching His body, and thus He felt a pleasing sensation.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The Supreme Personality of Godhead is always the unlimited. Although the Supreme Personality of Godhead, in His body as a tortoise, held on His back the largest of mountains, Mandara-parvata, He did not feel any inconvenience. On the contrary, He apparently felt some itching, and thus the rotation of the mountain was certainly very pleasing.
Srimad Bhagavatam Canto 08, Chapter 07, Text 09
Srimad Bhagavatam Canto 08, Chapter 07, Text 11