The Messenger of Allah ﷺ was never asked for anything in exchange for accepting Islam without giving it. A man came to him, and he gave him a flock of sheep filling the space between two mountains. The man returned to his people and said, "My people, accept Islam, for Muhammad gives like one who has no fear of poverty."
و حدثنا عاصم بن النضر التيمي حدثنا خالد يعني ابن الحارث حدثنا حميد
ما سئل رسول الله ﷺ على الإسلام شيئا إلا أعطاه قال فجاءه رجل فأعطاه غنما بين جبلين فرجع إلى قومه فقال يا قوم أسلموا فإن محمدا يعطي عطاء لا يخشى الفاقة