פּירוש אויף שמות 34:6

ה׳ ה׳ THE LORD, THE LORD — This is the attribute of Divine mercy. The one (the first ה׳) alludes to God having mercy on the sinner before he sins and the other after he has sinned and repented (Rosh Hashanah 17b).

ה', ה, according to Rashi, the repetition is to describe G-d‘s approachability before one has sinned with His approachability after one has sinned and repented. This is important seeing that sins such as idolatry, if not repented are treated as two sins, i.e. from the moment one contemplated to commit idolatry it is already considered sinful and punishable separately as soon as one had carried out that intention. This is based on Ezekiel 14,5 as interpreted in the Talmud tractate Kidushin, folio 40, למען תפוש את בית ישראל בלבם, “I will hold the house of Israel accountable for their thoughts.”When the sin of the spies was committed, the people were not held responsible for having had sinful thoughts previously, as they had not meant to reject the Hoy land until after they had been misled by the majority of the spies. This is what David refers to in Psalms 66,18: און אם ראיתי בלבי לא ישמע אדוני, “if I had an evil thought in my mind, the Lord would not have listened to it.” In that verse G-d’s name appears only once, in order to make that point.

'ויקרא ה' ה, He proclaimed: “The Lord, the Lord;” The meaning of this proclamation is that G–d announces that in His capacity as the attribute of Mercy, He continues practicing this attribute not only before man sins but also after man had sinned. This is how the Talmud, tractate Rosh Hashanah folio 17 interprets this proclamation. We need to delve more deeply into this subject. Since when had man been in need of this attribute of the Lord before he had sinned? We are forced to answer that seeing the Lord is aware of what goes on in the innermost regions of our heart, He was aware that we would commit sins even before we had converted sinful thoughts into sinful deeds. This is why both of these “names” of the Lord are actually two separate attributes of the thirteen attributes revealed to Moses at this point. On the other hand, the attribute known as נוצר חסד לאלפים, “storing up kindness for up to two thousand generations,” which apparently are two separate attributes are in reality only a single attribute. Rav Nissim, however, considers these words as two separate attributes, whereas he dos not consider the first word: “Hashem,” as one of the thirteen attributes. The plain meaning of the verse commencing with the words: ויעבור ה' על פניו ויקרא ה', ה' וגו', “the Lord passed by before him, etc.,” is that in times of need for the Lord’s Mercy, these thirteen attributes of the Lord are to be invoked in our prayers for help and forgiveness.