It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When a man sets out for Hajj with provision from lawful earnings, puts his foot in the stirrup (of his mount) and calls out: 'Labbayk Allahumma labbayk' (Here I am, O Allah, here I am), a caller from the heaven answers him: 'Labbayk wa sa'dayk' (your presence is accepted and may you be blessed with happiness); your provision is lawful, your mount is lawful, and your Hajj is accepted and free of sin. And when one sets out with provision from unlawful earnings, puts his foot in the stirrup and calls out 'Labbayk', the caller from the heaven answers him: 'La labbayk wa la sa'dayk' (your presence is not accepted, nor is there any happiness for you); your provision is unlawful, your spending is unlawful, and your Hajj is not accepted."
Hadith Referenceالمعجم الأوسط / باب الميم / 5228
Hadith Gradingمحدثین:إسناده ضعيف لضعف سليمان بن داود اليمامي
Hadith Takhrij«قال الهيثمي: فيه سليمان بن داود اليمامي وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 10، ص 292»» «أخرجه البزار فى «مسنده» برقم: 8638»