Dhan Guru Ramdas Sahib jee was doing kaar-sewa of sarovar at Siri Harmandir Sahib - Siri Amritsar Sahib. A lot of sangat used to do sewa in digging the sarovar and doing other kind of sewa. Bhai Soma was a Sikh of great humility and did lot of sewa. He used to to sell ghunganiyaan (a kind of snack) to residents of Siri Amritsar Sahib and this way made his living.
One day in the evening Guru Sahib saw him and asked him how much vattee (profit) he had made. He came over to Guru Sahib and did 'matha tek' (paid respect) and with extreme humility answered Guru Sahib. Guru Sahib asked him to hand over all his day's earnings. Bhai Soma did not hesitate for a bit and placed all he had at the 'charan' (feet) of Dhan Guru Ramdas Sache Paatshah jee.
Soma was a very poor person and met his ends with great difficulty. Second day too, Guru Sahib asked him how much he had earned and asked him to give all his earnings to him. Guru Sahib kept doing this for 5 days. Soma who was always broke, did not have any doubts on Guru Sahib. He trusted Guru Sahib one hundred percent and believed that Guru Sahib knows better.
On the sixth day, Soma saw Guru Sahib at the Sarovar looking at the sangat doing sewa, with full Kirpa-Drishtee (gaze of grace). This time Soma did not wait for Guru Sahib to ask for the money but he came, 'matha tekked' Guru Sahib and placed all his earning at the lotus feet of Guru Sahib. Guru Sahib, who was only testing Soma, was extremely pleased at Soma and said, "Today am not going to take anything from you but am going to give you. Hence forth you shall not be Soma but Soma Shah" (Shah means very rich person).
Guru Sahib's 'bachan' (word) of calling Soma, Soma Shah, showered the abundant force of Vaheguru's power to come in action. With waheguru jis grace Bhai Soma became a 'shah' (rich person) and kept expanding his business. He became a shah of not only money but also of Naam.