عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: مِفْتَاحُ الْجَنَّةِ الصَّلَاةُ وَ مِفْتَاحُ الصَّلَاةِ الْوُضُوءُ(ترمذی : ۴/كتاب الطهارة)
Translation
Hazrat Jabir bin Abdullah (may Allah be pleased with them) said that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Prayer is the key to Paradise, and the key to prayer is ablution (Wudu)."