In prostration, do all the toes have to touch the ground?
Question

                I know that it is obligatory to prostrate on seven parts, but do all the toes have to touch the ground when prostrating? If some of the toes did not touch the ground does that invalidate the prostration and the prayer?.
Praise be to Allah.
      It is obligatory to prostrate during prayer on the seven 
      parts that should touch the ground in prostration, which are: the forehead 
      (with which the nose is included), the two hands, the two knees and the 
      ends (toes) of the two feet, because of the report narrated by al-Bukhaari 
      (812) and Muslim (490) from Ibn ‘Abbaas (may Allah be pleased with him), 
      that the Messenger of Allah (blessings and peace of Allah be upon him) 
      said: ““I have been commanded to prostrate on seven bones: the forehead – 
      and he pointed to his nose – the hands, the knees and the ends of the feet 
      (i.e., toes).” 

    Al-Nawawi (may Allah have mercy on him) said: 

    If he omits one of these parts then his prayer is not valid. 
    End quote. 

    It says in Sharh Muntaha al-Iraadaat (1/432): 

    Prostrating on these seven bones, along with the nose, on the 
    place where one is praying, whether it is the ground or a mat or anything 
    else, is a pillar or essential part of the prayer if one is able to do that, 
    because of the hadeeth of Ibn ‘Abbaas. End quote. 

    The perfect way is for the part which is meant to touch the 
    ground in prostration should touch it fully, because when the Prophet 
    (blessings and peace of Allah be upon him) prostrated, he made the tips of 
    his toes point towards the qiblah (narrated by al-Bukhaari, 785); and 
    because of the report narrated by Abu Dawood from Rifaa‘ah ibn Raafi‘ (may 
    Allah be pleased with him) from the Prophet (blessings and peace of Allah be 
    upon him) who said to the one who did not pray properly: “When you 
    prostrate, make your prostration firm.” Classed as hasan by al-Albaani in 
    Saheeh Abi Dawood. Making the part which is meant to touch the ground in 
    prostration touch it fully is part of making the prostration firm. 

    It is acceptable to make the part which is meant to touch the 
    ground in prostration touch it partially, according to the correct view of 
    the Shaafa‘i and Hanbali madhhabs. 

    Al-Nawawi said in al-Majmoo‘ (3/423): 

    Prostrating on the forehead is obligatory, and there is no 
    difference of opinion among us concerning that. It is better to prostrate on 
    the whole forehead, but if one prostrates on it partially, that is 
    acceptable, although it is disliked. This is the correct view which was 
    stated by al-Shaafa‘i in al-Umm, and that was stated definitively by 
    the majority of our companions. Ibn Kajj and al-Daarimi narrated another 
    view that it is obligatory to place the whole forehead on the ground, but 
    this is an odd and weak view. End quote. 

    Al-Mardaawi said in al-Insaaf (2/418): 

    It is acceptable to make the part which is meant to touch the 
    ground in prostration touch it partially according to the correct view of 
    our madhhab. Ibn Tameem said: It is permissible to prostrate on part of the 
    hand and even on the back of the hand or the ends of the fingers; by the 
    same token (it is permissible to prostrate) on some of the toes and some of 
    the forehead… End quote. 

    It says in Mataalib Ooli al-Nuha (3/25): 

    It is acceptable to make the part which is meant to touch the 
    ground in prostration touch it partially because the hadeeth does not state 
    that the part should touch the ground fully. End quote. 

    Based on that, if a person prostrates on his feet and some of 
    his toes touch the ground, his prayer is valid, but the Sunnah is to 
    prostrate firmly on the parts of the body on which one rests during 
    prostration as much as possible. 

    And Allah knows best.