Is it really true that my everyday dealings, buying, selling, working, can count as worship, or is worship only what happens in the mosque?
No, worship is not shut inside the mosque. That habit of thinking, that the prayer mat is sacred ground while the shop, the office, the workshop are a lesser and worldly remainder, has settled into many of us, but it was not the way of the Prophet, peace be upon him, nor of those who walked the path of the heart after him. Allah, glory be to Him, did not divide your life into a sacred corner and a profane rest. He asked for all of it.
Consider how wide the surrender is that He teaches you to speak with your own tongue.
“Say: indeed my prayer, my rites of worship, my living and my dying are for Allah, Lord of the worlds.”
Qur’an, Al-An’am 6:162 · meaning
Your living is set beside your prayer, in the same breath, offered to the same Lord. So the honest weighing of your goods, the fair wage you pay, the patience you keep with a difficult customer, all of this is your living, and your living has already been handed over. Even the most ordinary act of care inside your own house is counted, for the Prophet, peace be upon him, said:
“Whatever you spend seeking the pleasure of Allah, you are rewarded for it, even the morsel you place in your wife’s mouth.”
The Prophet (peace be upon him), Sahih al-Bukhari and Sahih Muslim (Bukhari 56 / Muslim 1628) · meaning
And the worker is not left behind while the worshipper goes ahead. Notice how the mosque and the marketplace are named together, in one breath.
“Every day the sun rises, a charity is due upon every joint of a person: to deal justly between two people is a charity; to help a man with his mount, lifting him onto it or hoisting his belongings onto it, is a charity; a good word is a charity; every step you take towards the prayer is a charity; and removing something harmful from the road is a charity.”
The Prophet (peace be upon him), Sahih al-Bukhari (2989) and Sahih Muslim (1009) · meaning
The steps that carry you towards the prayer and the fair settling of a matter between two people stand in the same list, in the same currency. Helping a man lift his load onto his animal, one good word, clearing something harmful from the road, each of these is a charity in exactly the way the step towards the prayer is a charity. So your honest weighing at the counter, your patience with a hard customer, your hand under someone else’s burden, none of it is a pause in your worship. It is the place where your Lord is receiving it. In our Naqshbandi way there is a principle called khalwat dar anjuman, solitude within the crowd: the heart quietly turned to Allah while the hands are busy in the marketplace. You do not have to leave the world to find Him. The bustle of your trade can itself become a place of remembrance, your buying and selling threaded through with His name.
One small step: Tomorrow, before you begin your work, pause for one breath and say quietly in your heart, “O Allah, this too is for You,” then carry that single intention through the day.