Explanation

Tahleel is to declare the oneness of Allah by saying La ilaaha il-lal-laah (There is none worthy of worship except Allah/ There is no god but Allah). takbeer (Allahu Akbar), tahmeed (Alhamdulillah), tahleel (Laa ilaaha ill-Allah), and tasbeeh (SubhanAllah) in the first ten days of Dhul Hijjah.