At the Miqat, after wearing الإحرام garments and praying two ركعةs, declare your intention: For العمرة say 'Labbayk Allahumma Umratan' and for الحج say 'Labbayk Allahumma Hajjan.' Then begin the التلبية. If you fear being unable to complete, add: 'Allahumma mahilli haythu habastani.'
لَبَّيْكَ اللَّهُمَّ عُمْرَةً / لَبَّيْكَ اللَّهُمَّ حَجًّا. اللَّهُمَّ مَحِلِّي حَيْثُ حَبَسْتَنِي
Labbayk Allahumma 'Umratan / Labbayk Allahumma Hajjan. Allahumma mahilli haythu habastani.
Meaning: Here I am O Allah, answering Your call for العمرة / Here I am O Allah, answering Your call for الحج. O Allah, my place of ending (الإحرام) is wherever You prevent me (if unable to complete).
Source: Sahih al-Bukhari #5089Entering الإحرام at the Miqat is the gateway to the entire الحج. النبي (صلى الله عليه وسلم) showed that the intention must be declared verbally. Jabir's hadith of the Farewell الحج in صحيح مسلم (1218) details النبي's complete ritual at the Miqat. The conditional clause provides ease for those with valid concerns about completing the الحج.
لَبَّيْكَ اللَّهُمَّ عُمْرَةً / لَبَّيْكَ اللَّهُمَّ حَجًّا. اللَّهُمَّ مَحِلِّي حَيْثُ حَبَسْتَنِي
The Prophet (peace be upon him) said: 'The conditional clause is for anyone who fears being prevented from completing the pilgrimage. Duba'ah bint al-Zubayr came to him and said: O Messenger of Allah, I want to perform Hajj but I am ill. He said: Perform Hajj and stipulate the condition: O Allah, my place of ending is wherever You prevent me.'