Report to your group leader and police, then contact your embassy (most have temporary حج-season offices in مکہ مکرمہ) for an ایمرجنسی travel document.
Losing your passport during حج is stressful but manageable with the right steps. First, report the loss to your حج group leader or tour operator, as they often have experience with this situation and maintain relationships with the authorities. Then file a police report at the nearest Saudi police station — you will need this report number for the embassy process.
Contact your country's embassy or consulate immediately. During حج season, many countries set up temporary consular offices in مکہ مکرمہ and منیٰ specifically to handle such emergencies. The embassy will issue an ایمرجنسی travel document or temporary passport that allows you to complete your حج and return home. Always carry photocopies of your passport, visa, and حج permit in a separate location from the originals, and store digital copies on your phone or email as backup.