The ruling on selling Gold before receiving its Price
Question :
What is the ruling on giving gold before receiving its price? And what if the person who wants it is a relative and one fears from severing the family ties with him, even though I know quite well that he will pay its price, even if it is after some time?
Answer:
It is obligatory for you to know the general principle that selling gold for cash is never permissible unless the price is received in full. There is no difference in this between the relative and the stranger, because the religion of Allâh gives no preferential treatment to anyone. If the relative becomes angry with you due to your obedience of Allâh, then let him be angry. For verily, he is the wrongdoing sinner who wants you to fall into disobedience of Allâh. In reality, you have done an act of righteousness by prohibiting him from dealing with you in this forbidden transaction. Therefore, if he becomes angry or cuts you off due to this, then he is the sinner and no portion of his sin is on you.
Source:
Ash-Shaykh Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 4 Pages 401-402