Allah, Exalted is He, has commanded the believers to honour contracts and fulfil covenants.He, the Glorified, says, {And fulfil the covenant of Allah when you have taken it. [O believers], and do not break oaths after their confirmation.}[Quran 16:91].For this reason, the Prophet ﷺ warned in this hadeeth the one who kills a person with whom a covenant has been made – that is a person who enters the abode of Islam with assurances of safety and protection – that he will not smell the fragrance of Paradise,and its fragrance can be smelled from as far as the distance of travelling forty years.It is narrated on the authority of Aboo Hurayrah (may Allah be pleased with him) that the Prophet ﷺ said, “… the fragrance of Paradise can be found at a distance of seventy years.” [Sunan al-Tirmithee].Other narrations reported something else, distance-wise.The different versions of the hadeeth have been reconciled to conclude thateach distance depends on thedifferences in people, deeds, and variations in ranks. That is to say, some people will sense its fragrance from as far as the distance of a thousand years,while others will sense its fragrance from a distance of forty years, and for others, from a range in between these distances.All of these narrations describe a long distance. This hadeeth warns against betraying the covenants made with non-Muslims. It shows that Paradise is for those who fulfil covenants and those who do not betray them..