This Thoo Sev Jin Thoo Kee-aa
ਤਿਸੁ ਤੂ ਸੇਵਿ ਜਿਨਿ ਤੂ ਕੀਆ

This shabad is by Guru Arjan Dev in Raag Basant on Page 706
in Section 'Satsangath Utham Satgur Keree' of Amrit Keertan Gutka.