40 AH
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40 AH is a year in the Islamic calendar that corresponds to 660 – 661 CE.
| Centuries: | 1st century BH · 1st century AH · 2nd century AH |
| Decades: | 10s AH 20s AH 30s AH 40s AH 50s AH 60s AH 70s AH |
| Years: | 37 AH 38 AH 39 AH 40 AH 41 AH 42 AH 43 AH |
