The Prophet of Allah, sallallaahu ‘alayhi wa sallam, called them to have transactions with Allah, because that is the most successful transaction

«Indeed, those who recite the Book of Allah and establish prayer and spend [in His cause] out of what We have provided them, secretly and publicly, [can] expect a transaction [i.e. profit] that will never perish. That He may give them in full their rewards and increase for them of His bounty. Indeed, He is Forgiving and Appreciative.»

«A transaction [i.e. profit] that will never perish.» meaning, it will never stagnate or be spoiled, but rather, it is the best type of transactions, as well as, the most lofty and the more virtuous, surely, the [outcome of this] transaction is the pleasure of their Lord, winning by earning His plentiful reward, and being saved from His Anger and punishment.”

“O, Messenger of Allah! I was building a fence around my garden, but a date tree belonging to so and so stands between me and completing my fence, so order him to give it to me so I can finish my fence.’ The Prophet of Allah, sallallaahu ‘alayhi wa sallam, said to the man: ‘Give him that tree in exchange for a tree in Paradise.’ The man refused. Abu Ad-Dahdaah (a Companion) came to the man and said to him, ‘I will give you my garden for your tree,’ and he agreed. Abu Ad-Dahdaah came to the Messenger of Allah, sallallaahu ‘alayhi wa sallam, and said: ‘O, Messenger of Allah! I bought the date tree with my garden, so give it to man [who is building the fence] for I have given the tree to you.’ The Messenger of Allah, sallallaahu ‘alayhi wa sallam, repeatedly said: ‘How many date trees there will be for Abu AdDahdaah in Paradise!’ Abu Ad-Dahdaah went to his wife who was inside the garden and said to her, ‘Get out of the garden for I have sold it for a date tree in Paradise.’ She said: ‘What a successful trade!’”